function blankcheck(txt)
 {
  var s=txt;
  var i =0;
  var t=1;  
  while(i<s.length)
   {
     if (s.charAt(i) != ' ')
      t=0
      i++;
   }  

  if (t==0)
     return 0;
  else
     return 1;
 }
 
 function carFormValid(theForm) {
  var dt=theForm.B_LOCATION;	 
  if (blankcheck(theForm.B_LOCATION.value)) {
    alert("Enter Pick-up location." );
	dt.focus();
    return false;
  }

 var dt=theForm.pk_dt.value;var mn=theForm.pk_mon.value;var yr=theForm.pk_yr.value;	
  if (dt<10) dt="0" + dt;if (mn<10) mn="0" + mn;
  var fdate=dt + "/" + mn + "/" + yr;  
  if (isDate(fdate)==false){
	  theForm.pk_dt.focus();
	  return false;
  }
 
  var time=new Date();
  var cmonth=time.getMonth()+1;
  var cdate=time.getDate();
  var cyear=time.getYear();
  if (cmonth<10) cmonth="0" + cmonth;if (cdate<10) cdate="0" + cdate;
  var sysdate=cdate + "/" + cmonth + "/" + cyear; 
  if (CompareDates(sysdate,fdate)==false){
	 alert("Pick-up date must be greater than current date.");
	 theForm.pk_dt.focus();
	 return false;
  }	
  
 
  var dt=theForm.dp_dt.value;var mn=theForm.dp_mon.value;var yr=theForm.dp_yr.value;	
  if (dt<10) dt="0" + dt;if (mn<10) mn="0" + mn;
  var fdate2=dt + "/" + mn + "/" + yr;  
  if (isDate(fdate2)==false){
	  theForm.dp_dt.focus();
	  return false;
  }
  
  
  if (CompareDates(fdate,fdate2)==false){
	 alert("Pick-up cannot be greater than Drop-off date");
	 theForm.dp_dt.focus();
	 return false;
  }	
  
  return true;
  
}


 
 
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : dd/mm/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}
 

//********************

function CompareDates(dt1,dt2) 
{ 
   var str1  = dt1;
   var str2  = dt2;
   var dt1   = parseInt(str1.substring(0,2),10); 
   var mon1  = parseInt(str1.substring(3,5),10);
   var yr1   = parseInt(str1.substring(6,10),10); 
   var dt2   = parseInt(str2.substring(0,2),10); 
   var mon2  = parseInt(str2.substring(3,5),10); 
   var yr2   = parseInt(str2.substring(6,10),10); 
   var date1 = new Date(yr1, mon1, dt1); 
   var date2 = new Date(yr2, mon2, dt2); 
    
   if(date2 < date1)
   {
 	  return false; 
   }
   return true;
} 


/**************** HOTEL FORM CHECKING ************************/

 function hotelFormValid(theForm) {
   
  var dt=theForm.B_LOCATION;	 
  if (blankcheck(theForm.B_LOCATION.value)) {
    alert("Enter Destination city." );
	dt.focus();
    return false;
  }
  var dt=theForm.COUNTRY_CODE;	 
  if (blankcheck(theForm.COUNTRY_CODE.value)) {
    alert("Select Country Name." );
	dt.focus();
    return false;
  }  
 
  var dt=theForm.in_dt.value;var mn=theForm.in_mon.value;var yr=theForm.in_yr.value;	
  if (dt<10) dt="0" + dt;if (mn<10) mn="0" + mn;
  var fdate=dt + "/" + mn + "/" + yr;  
  if (isDate(fdate)==false){
	  theForm.in_dt.focus();
	  return false;
  }

  var time=new Date();
  var cmonth=time.getMonth()+1;
  var cdate=time.getDate();
  var cyear=time.getYear();
  if (cmonth<10) cmonth="0" + cmonth;if (cdate<10) cdate="0" + cdate;
  var sysdate=cdate + "/" + cmonth + "/" + cyear; 
  if (CompareDates(sysdate,fdate)==false){
	 alert("Check-in date must be greater than current date.");
	 theForm.in_dt.focus();
	 return false;
  }	
  
 
  var dt=theForm.out_dt.value;var mn=theForm.out_mon.value;var yr=theForm.out_yr.value;	
  if (dt<10) dt="0" + dt;if (mn<10) mn="0" + mn;
  var fdate2=dt + "/" + mn + "/" + yr;  
  if (isDate(fdate2)==false){
	  theForm.out_dt.focus();
	  return false;
  }
  
  if (CompareDates(fdate,fdate2)==false){
	 alert("Check-in cannot be greater than Check-out date");
	 theForm.out_dt.focus();
	 return false;
  }	
  
  return true;
  
}


/**************** FLIGHT FORM CHECKING ************************/

 function flightFormValid(theForm) {
	 
  var rtrip=theForm.air_rndtrip.checked;

  var dt=theForm.B_LOCATION_1;	 
  if (blankcheck(theForm.B_LOCATION_1.value)) {
    alert("Enter from city." );
	dt.focus();
    return false;
  }
  var dt=theForm.E_LOCATION_1;	 
  if (blankcheck(theForm.E_LOCATION_1.value)) {
    alert("Enter Destination city." );
	dt.focus();
    return false;
  }  
  var dt=theForm.dep_dt.value;var mn=theForm.dep_mon.value;var yr=theForm.dep_yr.value;	
  if (dt<10) dt="0" + dt;if (mn<10) mn="0" + mn;
  var fdate=dt + "/" + mn + "/" + yr;  
  if (isDate(fdate)==false){
	  dt.focus();
	  return false;
  }
  var time=new Date();
  var cmonth=time.getMonth()+1;
  var cdate=time.getDate();
  var cyear=time.getYear();
  if (cmonth<10) cmonth="0" + cmonth;if (cdate<10) cdate="0" + cdate;
  var sysdate=cdate + "/" + cmonth + "/" + cyear; 
  if (CompareDates(sysdate,fdate)==false){
	 alert("Departure date must be greater than current date.");
	 theForm.dep_dt.focus();
	 return false;
  }	  
  if (rtrip==true) {
  var dt=theForm.ret_dt.value;var mn=theForm.ret_mon.value;var yr=theForm.ret_yr.value;	
  if (dt<10) dt="0" + dt;if (mn<10) mn="0" + mn;
  var fdate2=dt + "/" + mn + "/" + yr;  	   
  if (isDate(fdate2)==false){
	  theForm.ret_dt.focus();
	  return false;
  }	 
 
  if (CompareDates(fdate,fdate2)==false){
	 alert("Return date must be greater than departure date");
	 theForm.ret_dt.focus();
	 return false;
  }	}
  
  return true;
  
}

function disbaleDt(){
 var rtrip=document.forms['FLIGHTForm'].air_rndtrip.checked;
 if (rtrip==true) {
  document.forms['FLIGHTForm'].ret_dt.disabled=false; 
  document.forms['FLIGHTForm'].ret_mon.disabled=false; 
  document.forms['FLIGHTForm'].ret_yr.disabled=false;	
 }	else {
  document.forms['FLIGHTForm'].ret_dt.disabled=true; 
  document.forms['FLIGHTForm'].ret_mon.disabled=true; 
  document.forms['FLIGHTForm'].ret_yr.disabled=true;		 
 }
}