function isLeapYear(year){
        if(( year%4==0 && year%100==0 )|| year%400==0 )
          return true;
        else
          return false;
        }

function maxDay(month,year){
        if(isLeapYear(year)){
                maxDayMonth=new Array(31,29,31,30,31,30,31,31,30,31,30,31);
        }else{
                maxDayMonth=new Array(31,28,31,30,31,30,31,31,30,31,30,31);
        }
        return maxDayMonth[month];
        }

function adjust_dates()
         {
         d = new Date();
         day = d.getDate();
         month = d.getMonth();
         month_name = new Array("January","February","March","April","May","June","July","August","September","October","November","December");

         document.FrontPage_Form1.DaysToStay.selectedIndex = 0;
         document.FrontPage_Form1.ARRIVAL_DATE.selectedIndex  = day-0;
         document.FrontPage_Form1.ARRIVAL_MONTH.selectedIndex = month;
         document.forms[0].ARRIVAL_MONTH.onchange();
         }

function determineyear(month,day){
        thisDate=new Date();
        thisYear=thisDate.getYear();
        thisMonth=thisDate.getMonth();
        thisDay=thisDate.getDate();

        if((month+1)<thisMonth){year=thisYear+1;}
                else {if((month+1)==thisMonth){
                                if(day>=thisDay){year=thisYear;}
                                        else{year=thisYear+1;}
                                }else{year=thisYear+1;}}
        return year;

        }


function checkDates(el){
        var days;
        var inDate,inDay,inMonth,inYear;
        var outDate,outDay,outMonth,outYear;

        form=document.th_start;//dereference
        ms=86400000; //ms in 24 hours
        inDay=document.FrontPage_Form1.ARRIVAL_DATE.selectedIndex+1;
        inMonth=document.FrontPage_Form1.ARRIVAL_MONTH.selectedIndex;
        inYear=determineyear(inMonth,inDay);
        outDay=document.FrontPage_Form1.DEPARTURE_DATE.selectedIndex+1;
        outMonth=document.FrontPage_Form1.DEPARTURE_MONTH.selectedIndex;
        outYear=determineyear(outMonth,outDay);

        if(inDay>maxDay(inMonth,inYear)){ inDay=maxDay(inMonth,inYear);}
        if(outDay>maxDay(outMonth,outYear)){ outDay=maxDay(outMonth,outYear);}
 
        inDate=new Date(inYear,inMonth,inDay);
        outDate=new Date(outYear,outMonth,outDay);

        if(el.name=='DaysToStay'){
                DaysToStay=document.FrontPage_Form1.DaysToStay.selectedIndex+1;
                outDate.setTime(inDate.getTime()+DaysToStay*ms);
        }else if(el.name=='ARRIVAL_DATE' || el.name=='ARRIVAL_MONTH'){
                DaysToStay=document.FrontPage_Form1.DaysToStay.selectedIndex+0;
                outDate.setTime(inDate.getTime()+DaysToStay*ms);
        }else if(el.name=='DEPARTURE_DATE' || el.name=='DEPARTURE_MONTH'){
                DaysToStay=(outDate-inDate)/ms;
       }

        document.FrontPage_Form1.ARRIVAL_MONTH.selectedIndex=inDate.getMonth();
        document.FrontPage_Form1.ARRIVAL_DATE.selectedIndex=inDate.getDate()-1;
        document.FrontPage_Form1.DEPARTURE_MONTH.selectedIndex=outDate.getMonth();
        document.FrontPage_Form1.DEPARTURE_DATE.selectedIndex=outDate.getDate()-1;
        document.FrontPage_Form1.DaysToStay.selectedIndex=DaysToStay-0;

        if(inDate<(thisDate)) alert("     Sorry! Arrival date has already passed!     \n\nPlease select a valid date starting from tomorrow.  \n\n               Click OK to continue   "); 

        if(DaysToStay=0) alert("     Sorry! We can only accept    \n\n reservations of 1 nights or more \n\n    Click OK to continue   ");
        
        if(DaysToStay>180) alert("  Please note! We can only accept reservations of up to 180 nights   ");
              
       }


function openWindow(url,top,left,width,height){
        popupWin = window.open(url, 'remote', 'scrollbars=yes,toolbars=no,resizable=no,top=' 
        + top + ',left=' + left + ',width=' + width + ',height=' + height);
}