function isBrowserSupp() {
    // Get the version of the browser
    version =  parseFloat( navigator.appVersion );

    if ( ( version >= 2.0 ) && ( version < 2.1 ) && ( navigator.appName.indexOf( "Netscape" ) != -1 ) ) {
        return false;
    }
    else {
    return true;
    }

return true;
}

function isLeapYear(yrStr)
{

var leapYear=false;
var year = parseInt(yrStr, 10);

// every fourth year is a leap year
if (year%4 == 0)
    {
    leapYear=true;
    // unless it's a multiple of 100
    if (year%100 == 0)
        {
        leapYear=false;
        // unless it's a multiple of 400
        if (year%400 == 0)
            {
            leapYear=true;
            }
        }
    }
return leapYear;
}


function getDaysInMonth(mthIdx, YrStr)
{
// all the rest have 31
var maxDays=31
// expect Feb. (of course)
if (mthIdx==1)
    {
    if (isLeapYear(YrStr))
        {
        maxDays=29;
        }
    else
        {
        maxDays=28;
        }
    }
// thirty days hath...
if (mthIdx==3 || mthIdx==5 || mthIdx==8 || mthIdx==10)
    {
    maxDays=30;
    }
return maxDays;
}
//the function which does some magic to the date fields
// return non-zero if it is the last day of the month
function adjustDate(mthIdx, Dt)
{
var value=0;

var today = new Date()

var theYear

if (state_CurrentYear == null || state_CurrentYear == "" ) {
	theYear = parseInt(today.getYear(),10)
} else {
	theYear = (parseInt(state_CurrentYear) -1);
}

if (mthIdx < today.getMonth()) {
    //theYear = (parseInt(state_CurrentYear) + 1)
    theYear = state_CurrentYear;
}

if(theYear<100){
    theYear = "19" + theYear
}
else{
    if((theYear-100) < 10){
        theYear = "0" + (theYear-100)
    }
    else{
        theYear = (theYear-100)+""
    }
    theYear = "20" + theYear
}

var numDays=getDaysInMonth(mthIdx, theYear);

if (mthIdx==1)
    {
    
    if (Dt.options.selectedIndex + 1 < numDays)
        {
        return 0;
        }
    else
        {
        Dt.options.selectedIndex=numDays - 1;
        //check for leap year
        if (numDays==29)
            {
            return 99;
            }
        else
            {
            return 1;
            }
        }
    }
if (Dt.options.selectedIndex + 1 < numDays)
    {
    value=0;
    }
else
    {
    if (Dt.options.selectedIndex + 1 > numDays)
        {
        Dt.options.selectedIndex--;
        value=3;
        }
    else
        {
        //index is 31 or 30
        value=2;
        }
    }
return value;
}

//changes departure month when arrival month is changed
function amadChange(inM,inD,outM,outD)
{
if (!isBrowserSupp())
    {
    return;
    }

var res = adjustDate(inM.options.selectedIndex, inD);
if (res != 0)
    {
           outD.options.selectedIndex=0;
           if (inM.options.selectedIndex==11){
            outM.options.selectedIndex=0
           }
           else{
            outM.options.selectedIndex=inM.options.selectedIndex + 1;
           }
    }
else
    {
    outM.options.selectedIndex = inM.options.selectedIndex;
    outD.options.selectedIndex = inD.options.selectedIndex+1;
    }
return;
}

function dmddChange(outM,outD,inM,inD)
{
if (!isBrowserSupp())
    {
    return;
    }

adjustDate(outM.options.selectedIndex,outD );
if (((outM.options.selectedIndex < inM.options.selectedIndex) && (inM.options.selectedIndex != 11)) || ((outM.options.selectedIndex == inM.options.selectedIndex) && (outD.options.selectedIndex <= inD.options.selectedIndex)))
	{
		amadChange(inM,inD,outM,outD);
	}
return;
}



function getLayer(layer) {
	if (document.all)
		return eval('document.all.'+layer);
	if (document.getElementById)
		return document.getElementById(layer);
	return eval('document.'+layer);
}
	
function toggleVisibility(div1,div2) {
	var firstLayer
	var secondLayer
	var tempStyle
	var simpleLinkLayer
	
	firstLayer = getLayer(div1);
	secondLayer = getLayer(div2);
	simpleLinkLayer = getLayer('simpleLink');
	
	if (simpleLinkLayer.style.display == 'none')
	{
		simpleLinkLayer.style.display = 'block';
	}else{
		simpleLinkLayer.style.display = 'none';
	}
	
	tempStyle = firstLayer.style.display;
	firstLayer.style.display = secondLayer.style.display;
	secondLayer.style.display = tempStyle;
}

function validateForm(theForm)
{
	//check city
	theForm.submitButton.disabled = true;
	if (theForm.destination.value == "")
	{
		event.returnValue = false;
		theForm.submitButton.disabled = false;
		alert("Please enter a destination");
	}
	
	//Get rid of all punctuation and wierd stuff and replace with comas
	var regExpr = /[ !\"£$.\^\&\*\(\)\+\-\=\`\¬\¦\{\}\:\;\'\@\#\~\|\\\<\>\,\.\?\/\[\]]/g
	theForm.hiddenDestination.value = theForm.destination.value.replace(regExpr, ",");
	while (theForm.hiddenDestination.value.indexOf(",,") != -1)
	{
		theForm.hiddenDestination.value = theForm.hiddenDestination.value.replace(",,", ",");
	}
	
	if (theForm.hiddenDestination.value.charAt(theForm.hiddenDestination.value.length-1) == ",") theForm.hiddenDestination.value = theForm.hiddenDestination.value.substring(0, theForm.hiddenDestination.value.length-1);
	if (theForm.hiddenDestination.value.charAt(0) == ",") theForm.hiddenDestination.value = theForm.hiddenDestination.value.substring(1, theForm.hiddenDestination.value.length-1);

	//check dates
	var toDay = new Date()
	var toMonth = toDay.getMonth()
	var toYear = toDay.getFullYear()
	var inY, outY
	var startDate
	var endDate
	var dateDiff
	
	inY = toYear;
	outY = toYear;
	if ((theForm.dm.options.selectedIndex < theForm.am.options.selectedIndex) || ((theForm.dm.options.selectedIndex == theForm.am.options.selectedIndex)&&(theForm.dd.options.selectedIndex < theForm.ad.options.selectedIndex)) )
	{
		outY++;
	}
	if (theForm.am.options.selectedIndex < toMonth) inY = toYear + 1;
	if (theForm.dm.options.selectedIndex < toMonth) outY = toYear + 1;
	
	startDate = new Date(inY,theForm.am.options.selectedIndex,theForm.ad.options.selectedIndex + 1);
	endDate = new Date(outY,theForm.dm.options.selectedIndex,theForm.dd.options.selectedIndex + 1);
	dateDiff = endDate - startDate
	if ((dateDiff/86400000) > 30)
	{
		event.returnValue = false;
		theForm.submitButton.disabled = false;
		alert("We cannot book for more than 30 nights. Please select different dates");
	}
}

var weekend = [0,6];
var weekendColor = "#6699ff";
var fontface = "Verdana";
var fontsize = 1;
var state_CurrentYear; // This variable retains the year as state, after it has already been selected from the picker.
var gNow = new Date();
var ggWinCal;
isNav = (navigator.appName.indexOf("Netscape") != -1) ? true : false;
isIE = (navigator.appName.indexOf("Microsoft") != -1) ? true : false;

Calendar.Months = ["January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"];

// Non-Leap year Month days..
Calendar.DOMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
// Leap year Month days..
Calendar.lDOMonth = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

function Calendar(p_item, p_item1, p_WinCal, p_month, p_year) {
 if ((p_month == null) && (p_year == null)) return;
 if (p_WinCal == null){
  this.gWinCal = ggWinCal;
 } else { 
  this.gWinCal = p_WinCal;
 }
 
 this.gMonthName = Calendar.get_month(p_month);
 this.gMonth = new Number(p_month);
 this.gYear = p_year;
 this.gBGColor = "white";
 this.gFGColor = "black";
 this.gTextColor = "black";
 this.gHeaderColor = "black";
 this.gReturnItem = p_item;
 this.gReturnItem1 = p_item1;
}

Calendar.get_month = Calendar_get_month;
Calendar.get_daysofmonth = Calendar_get_daysofmonth;
Calendar.calc_month_year = Calendar_calc_month_year;

function Calendar_get_month(monthNo) {
 return Calendar.Months[monthNo];
}

function Calendar_get_daysofmonth(monthNo, p_year) {
 /* 
 Check for leap year ..
 1.Years evenly divisible by four are normally leap years, except for... 
 2.Years also evenly divisible by 100 are not leap years, except for... 
 3.Years also evenly divisible by 400 are leap years. 
 */
 if ((p_year % 4) == 0) {
  if ((p_year % 100) == 0 && (p_year % 400) != 0) {
   return Calendar.DOMonth[monthNo];
  }
  return Calendar.lDOMonth[monthNo];
 } else {
  return Calendar.DOMonth[monthNo];
 }
}

function Calendar_calc_month_year(p_Month, p_Year, incr) {
 /* 
 Will return an 1-D array with 1st element being the calculated month 
 and second being the calculated year 
 after applying the month increment/decrement as specified by 'incr' parameter.
 'incr' will normally have 1/-1 to navigate thru the months.
 */
 var ret_arr = new Array();
 
  if (incr == -1) 
 {
  // B A C K W A R D
  if (p_Month == 0) {
   ret_arr[0] = 11;
   ret_arr[1] = parseInt(p_Year) - 1;
  } else {
		ret_arr[0] = parseInt(p_Month) - 1;
		// no negative booking, should the user scroll back then the year will automatically default to next year.
		if ( ( ( parseInt( p_Month ) <= parseInt( gNow.getMonth() ) ) ) && ( parseInt( p_Year  ) == parseInt( gNow.getFullYear().toString() ) ) ) {
			ret_arr[1] = parseInt(p_Year) + 1;
		} 
		else { 
			ret_arr[1] = parseInt(p_Year); 
		}
  }
 } 
 else if (incr == 1) {
  // F O R W A R D
  if (p_Month == 11) {
   ret_arr[0] = 0;
   ret_arr[1] = parseInt(p_Year) + 1;
  } 
  else {
   ret_arr[0] = parseInt(p_Month) + 1;
   ret_arr[1] = parseInt(p_Year);
  }
 }
 
 // store the year for the next time the user selects the calendar picker
 // If you leave the picker on december and open and close it a few times
 // without this the year's will keep incrementing. But with this they dont.
 if (p_Month == 11) {
	state_CurrentYear = parseInt(ret_arr[1]) - 1; 
 }
 else {
	state_CurrentYear = ret_arr[1];
 }
 return ret_arr;
}

// This is for compatibility with Navigator 3, we have to create and discard one object before the prototype object exists.
new Calendar();

Calendar.prototype.getMonthlyCalendarCode = function() {
 var vCode = "";
 var vHeader_Code = "";
 var vData_Code = "";
 
 // Begin Table Drawing code here..
 vCode = vCode + "<div align='Center'><TABLE BORDER=1 BGCOLOR=\"" + this.gBGColor + "\">";
 
 vHeader_Code = this.cal_header();
 vData_Code = this.cal_data();
 vCode = vCode + vHeader_Code + vData_Code;
 
 vCode = vCode + "</TABLE></div>";
 
 return vCode;
}

Calendar.prototype.show = function() {
 var vCode = "";
 
 this.gWinCal.document.open();

 // Setup the page...
 this.wwrite("<html>");
 this.wwrite("<head><title>Calendar</title>");
 this.wwrite("</head>");

 this.wwrite("<body " + 
  "link=\"" + this.gLinkColor + "\" " + 
  "vlink=\"" + this.gLinkColor + "\" " +
  "alink=\"" + this.gLinkColor + "\" " +
  "text=\"" + this.gTextColor + "\">");
 // Show navigation buttons
 var prevMMYYYY = Calendar.calc_month_year(this.gMonth, this.gYear, -1);
 var prevMM = prevMMYYYY[0];
 var prevYYYY = prevMMYYYY[1];

 var nextMMYYYY = Calendar.calc_month_year(this.gMonth, this.gYear, 1);
 var nextMM = nextMMYYYY[0];
 var nextYYYY = nextMMYYYY[1];
 
 this.wwrite("<TABLE WIDTH='100%' BORDER=0 CELLSPACING=0 CELLPADDING=0><TR><TD ALIGN=center bgcolor='#6699ff'>");
 this.wwrite("<Font size='1'><A HREF=\"" +
  "javascript:window.opener.Build(" + 
  "'" + this.gReturnItem + "', '" + this.gReturnItem1 + "', '" + prevMM + "', '" + prevYYYY + "'" + ");" +
  "\"><<\/A></Font></TD><TD ALIGN='center' bgcolor='" + this.gHeaderColor + "'>");
 
 this.wwriteA("<FONT FACE='" + fontface + "' Color='white' SIZE=1><B>");
 this.wwriteA(this.gMonthName + " " + this.gYear  );
 this.wwriteA("</B></TD><TD ALIGN=center bgcolor='#6699ff'>");

 this.wwrite("<Font size='1'><A HREF=\"" +
  "javascript:window.opener.Build(" + 
  "'" + this.gReturnItem + "', '" + this.gReturnItem1 + "', '" + nextMM + "', '" + nextYYYY + "'" + ");" +
  "\">><\/A></Font></TD></TR></TABLE><BR>");

 // Get the complete calendar code for the month..
 vCode = this.getMonthlyCalendarCode();
 this.wwrite(vCode);

 this.wwrite("</font></body></html>");
 this.gWinCal.document.close();
}

Calendar.prototype.wwrite = function(wtext) {
 this.gWinCal.document.writeln(wtext);
}

Calendar.prototype.wwriteA = function(wtext) {
 this.gWinCal.document.write(wtext);
}

Calendar.prototype.cal_header = function() {
 var vCode = "";
 
 vCode = vCode + "<TR bgcolor='" + this.gHeaderColor + "'>";
 vCode = vCode + "<TD WIDTH='14%' align='center' ><FONT SIZE='1' FACE='" + fontface + "' COLOR='white'><B>S</B></FONT></TD>";
 vCode = vCode + "<TD WIDTH='14%' align='center'><FONT SIZE='1' FACE='" + fontface + "' COLOR='white'><B>M</B></FONT></TD>";
 vCode = vCode + "<TD WIDTH='14%' align='center'><FONT SIZE='1' FACE='" + fontface + "' COLOR='white'><B>T</B></FONT></TD>";
 vCode = vCode + "<TD WIDTH='14%' align='center'><FONT SIZE='1' FACE='" + fontface + "' COLOR='white'><B>W</B></FONT></TD>";
 vCode = vCode + "<TD WIDTH='14%' align='center'><FONT SIZE='1' FACE='" + fontface + "' COLOR='white'><B>T</B></FONT></TD>";
 vCode = vCode + "<TD WIDTH='14%' align='center'><FONT SIZE='1' FACE='" + fontface + "' COLOR='white'><B>F</B></FONT></TD>";
 vCode = vCode + "<TD WIDTH='16%' align='center'><FONT SIZE='1' FACE='" + fontface + "' COLOR='white'><B>S</B></FONT></TD>";
 vCode = vCode + "</TR>";
 
 return vCode;
}

Calendar.prototype.cal_data = function() {
 var vDate = new Date();
 vDate.setDate(1);
 vDate.setMonth(this.gMonth);
 vDate.setFullYear(this.gYear);

 var vFirstDay=vDate.getDay();
 var vDay=1;
 var vLastDay=Calendar.get_daysofmonth(this.gMonth, this.gYear);
 var vOnLastDay=0;
 var vCode = "";

 /*
 Get day for the 1st of the requested month/year..
 Place as many blank cells before the 1st day of the month as necessary. 
 */	

 vCode = vCode + "<TR>";
 for (i=0; i<vFirstDay; i++) {
  vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(i) + "><FONT SIZE='1' FACE='" + fontface + "'> </FONT></TD>";
 }

 // Write rest of the 1st week
 for (j=vFirstDay; j<7; j++) {
  vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j) + "><FONT SIZE='1' FACE='" + fontface + "'>" + 
   "<A HREF='#' " + 
    "onClick=\"self.opener.document." + this.gReturnItem + ".selectedIndex='" + 
     (vDay - 1) + 
     "';self.opener.document." + this.gReturnItem1  + ".selectedIndex=" + this.gMonth + ";" 
     if (this.gReturnItem == 'frm_Search.ad' || this.gReturnItem == 'frm_Search.nad') {
      if (this.gReturnItem == 'frm_Search.ad') {
       vCode = vCode + "self.opener.amadChange(self.opener.document.frm_Search.am,self.opener.document.frm_Search.ad,self.opener.document.frm_Search.dm,self.opener.document.frm_Search.dd);";
      } else {
       vCode = vCode + "self.opener.amadChange(self.opener.document.frm_Search.nam,self.opener.document.frm_Search.nad,self.opener.document.frm_Search.ndm,self.opener.document.frm_Search.ndd);";
      }
     } else {
      if (this.gReturnItem == 'frm_Search.dd') {
       vCode = vCode + "self.opener.dmddChange(self.opener.document.frm_Search.dm,self.opener.document.frm_Search.dd,self.opener.document.frm_Search.am,self.opener.document.frm_Search.ad);";
      } else {
       vCode = vCode + "self.opener.dmddChange(self.opener.document.frm_Search.ndm,self.opener.document.frm_Search.ndd,self.opener.document.frm_Search.nam,self.opener.document.frm_Search.nad);";
      }
     }
     vCode = vCode + "window.close();\">" + 
     this.format_day(vDay) +
   "</A>" + 
   "</FONT></TD>";
  vDay=vDay + 1;
 }
 vCode = vCode + "</TR>";

 // Write the rest of the weeks
 for (k=2; k<7; k++) {
  vCode = vCode + "<TR>";

  for (j=0; j<7; j++) {
   vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j) + "><FONT SIZE='1' FACE='" + fontface + "'>" + 
    "<A HREF='#' " + 
     "onClick=\"self.opener.document." + this.gReturnItem + ".selectedIndex='" + 
     (vDay - 1) + 
     "';self.opener.document." + this.gReturnItem1  + ".selectedIndex=" + this.gMonth + ";"
     if (this.gReturnItem == 'frm_Search.ad' || this.gReturnItem == 'frm_Search.nad') {
      if (this.gReturnItem == 'frm_Search.ad') {
       vCode = vCode + "self.opener.amadChange(self.opener.document.frm_Search.am,self.opener.document.frm_Search.ad,self.opener.document.frm_Search.dm,self.opener.document.frm_Search.dd);";
      } else {
       vCode = vCode + "self.opener.amadChange(self.opener.document.frm_Search.nam,self.opener.document.frm_Search.nad,self.opener.document.frm_Search.ndm,self.opener.document.frm_Search.ndd);";
	  }      
     } else {
      if (this.gReturnItem == 'frm_Search.dd') {
       vCode = vCode + "self.opener.dmddChange(self.opener.document.frm_Search.dm,self.opener.document.frm_Search.dd,self.opener.document.frm_Search.am,self.opener.document.frm_Search.ad);";
      } else {
       vCode = vCode + "self.opener.dmddChange(self.opener.document.frm_Search.ndm,self.opener.document.frm_Search.ndd,self.opener.document.frm_Search.nam,self.opener.document.frm_Search.nad);";
      }
     }
     vCode = vCode + "window.close();\">" + 
     this.format_day(vDay) + 
    "</A>" + 
    "</FONT></TD>";
   vDay=vDay + 1;

   if (vDay > vLastDay) {   
    vOnLastDay = 1;
    break;
   }
  }

  if (j == 6) {
   vCode = vCode + "</TR>";
  }
  if (vOnLastDay == 1) {
   break;
  }
 }
 
 // Fill up the rest of last week with proper blanks, so that we get proper square blocks
 for (m=1; m<(7-j); m++) {
  vCode = vCode + "<TD WIDTH='14%'" + this.write_weekend_string(j+m) + 
  "><FONT SIZE='1' FACE='" + fontface + "' COLOR='gray'>" + m + "</FONT></TD>";
 }
 return vCode;
}

Calendar.prototype.format_day = function(vday) {
	var vNowDay = gNow.getDate();
	var vNowMonth = gNow.getMonth();
	var vNowYear = gNow.getFullYear();

	if (vday == vNowDay && this.gMonth == vNowMonth && this.gYear == vNowYear) {
		return ("<FONT COLOR=\"RED\"><B>" + vday + "</B></FONT>");
	} else {
		return (vday);
	}
}

Calendar.prototype.write_weekend_string = function(vday) {
	var i;
	// Return special formatting for the weekend day.
	for (i=0; i<weekend.length; i++) {
		if (vday == weekend[i]) {
			return (" BGCOLOR=\"" + weekendColor + "\"");
		}
	}
	return "";
}

function Build(p_item, p_item1, p_month, p_year) {
 var p_WinCal = ggWinCal;
 gCal = new Calendar(p_item, p_item1, p_WinCal, p_month, p_year);

 // Customize your Calendar here..
 gCal.gBGColor="white";
 gCal.gLinkColor="#3a4f98";
 gCal.gTextColor="#3a4f98";
 gCal.gHeaderColor="#3a4f98";

 gCal.show();
}


function show_calendar() {
	/* 
	p_month : 0-11 for Jan-Dec; 12 for All Months.
	p_year : 4-digit year
	p_format: Date format (mm/dd/yyyy, dd/mm/yy, ...)
	p_item : Return Item.
	*/
		
	p_item = arguments[0];
	p_item1 = arguments[1];
	if (arguments[2] == null) {
		p_month = new String(gNow.getMonth());
	} else { 
		p_month = arguments[2];
	}

	// Check if the year was stored previously, i.e. If the calendar picker had been opened previously
	// if it had it has a value otherwise, just assign it the current value.
	if ( ( arguments[3] == "" || arguments[3] == null ) && ( state_CurrentYear == "" || state_CurrentYear == null ) ) {
		p_year = new String(gNow.getFullYear().toString());
	} else { 
		p_year = state_CurrentYear;
	}
	
	//if the given month is < than the current and the years are equal then advance to the next year. No negative booking.
	// This pieces of code, provides this facility where the month is selected from bookinginfo.asp.
	if ( ( parseInt( p_month ) < parseInt( gNow.getMonth() ) ) && ( parseInt( p_year ) == parseInt( gNow.getFullYear().toString() ) ) ) {
		p_year = parseInt(p_year) + 1;
	}
 
	vWinCal = window.open("", "Calendar", "width=170,height=200,status=no,resizable=no,top=200,left=200");
	vWinCal.opener = self;
	ggWinCal = vWinCal;
 
 Build(p_item, p_item1, p_month, p_year);
}