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

//Customised Tour -- Bookings
function chk_tours(){
var tourname;
tourname=document.form1.tname.value;
if (document.form1.txtname.value=="")
    {
      alert("Please Enter Name " );
      document.form1.txtname.focus();
      return false;
    }
dp_date = document.form1.txtdepart.value;  
  if (dp_date=="")
   {
    alert("Please enter departure date");
	document.form1.txtdepart.focus();  
	return false;
   }
   var dt=document.form1.txtdepart;
	if (isDate(dt.value)==false){
		dt.focus();
		return false;
	}
	if (document.form1.txtpersons.value=="")
    {
      alert("Please Enter Number of Persons" );
      document.form1.txtpersons.focus();
      return false;
    }	
	if (document.form1.txtacc.value=="")
    {
      alert("Please Enter Type of accomodation needed" );
	  document.form1.txtacc.focus();
      return false;
    }
	if (tourname == "Customised Tour")
    {
		if (document.form1.txtplaces.value=="")
		{
		  alert("Please Enter Places to Visit" );
		  document.form1.txtplaces.focus();
		  return false;
		}	
		if (document.form1.txtite.value=="")
		{
		  alert("Please Enter Intended Itenerary" );
		  document.form1.txtite.focus();
		  return false;
		}	
	}	

if (document.form1.txtphone.value=="")
    {
      alert("Please Enter Telephone Number" );
      document.form1.txtphone.focus();
      return false;
    }	
	if (isNaN(document.form1.txtphone.value))
    {
      alert("Telephone Number should be an integer" );
      document.form1.txtphone.focus();
      return false;
    }	

	 if (document.form1.txtemail.value=="")
    {
      alert("please enter your Email Id" );
      document.form1.txtemail.focus();
      return false;
    }
 if (invalidemail(document.form1.txtemail.value))
    {
  
  alert("Email address should be of type 'abc@pqr.some extention' ");
       document.form1.txtemail.focus();
       return false;
    }
return true;
}

//Flight Bookings

function chk_flights(){
if (document.form1.txtname.value=="")
    {
      alert("Please Enter Name " );
      document.form1.txtname.focus();
      return false;
    }
dp_date = document.form1.txtdepart.value;  
  if (dp_date=="")
   {
    alert("Please enter departure date");
	document.form1.txtdepart.focus();  
	return false;
   }
   var dt=document.form1.txtdepart;
	if (isDate(dt.value)==false){
		dt.focus();
		return false;
	}
	if (document.form1.txtreturn.value=="")
    {
      alert("Please Enter One Way/ Return" );
      document.form1.txtreturn.focus();
      return false;
    }
	if (document.form1.txtfrom.value=="")
    {
      alert("Please Enter Sectors - From" );
      document.form1.txtfrom.focus();
      return false;
    }
	if (document.form1.txtto.value=="")
    {
      alert("Please Enter Sectors - To" );
      document.form1.txtto.focus();
      return false;
    }
	if (document.form1.txtpersons.value=="")
    {
      alert("Please Enter Number of Persons" );
      document.form1.txtpersons.focus();
      return false;
    }	
	if (document.form1.txtphone.value=="")
    {
      alert("Please Enter Telephone Number" );
      document.form1.txtphone.focus();
      return false;
    }	
	 if (document.form1.txtemail.value=="")
    {
      alert("please enter your Email Id" );
      document.form1.txtemail.focus();
      return false;
    }
 if (invalidemail(document.form1.txtemail.value))
    {
	  alert("Email address should be of type 'abc@pqr.some extention' ");
       document.form1.txtemail.focus();
       return false;
    }
return true;
}

//Railway booking

function chk_rail(){
if (document.form1.txtname.value=="")
    {
      alert("Please Enter Name " );
      document.form1.txtname.focus();
      return false;
    }
dp_date = document.form1.txtdepart.value;  
  if (dp_date=="")
   {
    alert("Please enter departure date");
	document.form1.txtdepart.focus();  
	return false;
   }
   var dt=document.form1.txtdepart;
	if (isDate(dt.value)==false){
		dt.focus();
		return false;
	}
	if (document.form1.txtfrom.value=="")
    {
      alert("Please Enter Sectors - From" );
      document.form1.txtfrom.focus();
      return false;
    }
	if (document.form1.txtto.value=="")
    {
      alert("Please Enter Sectors - To" );
      document.form1.txtto.focus();
      return false;
    }
	if (document.form1.txtpersons.value=="")
    {
      alert("Please Enter Number of Persons" );
      document.form1.txtpersons.focus();
      return false;
    }	
	if (document.form1.txtphone.value=="")
    {
      alert("Please Enter Telephone Number" );
      document.form1.txtphone.focus();
      return false;
    }	
		if (isNaN(document.form1.txtphone.value))
    {
      alert("Telephone Number should be an integer" );
      document.form1.txtphone.focus();
      return false;
    }	

	 if (document.form1.txtemail.value=="")
    {
      alert("please enter your Email Id" );
      document.form1.txtemail.focus();
      return false;
    }
 if (invalidemail(document.form1.txtemail.value))
    {
	  alert("Email address should be of type 'abc@pqr.some extention' ");
       document.form1.txtemail.focus();
       return false;
    }
return true;
}

function chk_car(){
if (document.form1.txtname.value=="")
    {
      alert("Please Enter Name " );
      document.form1.txtname.focus();
      return false;
    }
dp_date = document.form1.txtdepart.value;  
  if (dp_date=="")
   {
    alert("Please enter departure date");
	document.form1.txtdepart.focus();  
		return false;
   }
   var dt=document.form1.txtdepart;
	if (isDate(dt.value)==false){
		dt.focus();
		return false;
	}
	if (document.form1.txtfrom.value=="")
    {
      alert("Please Enter Sectors - From" );
      document.form1.txtfrom.focus();
      return false;
    }
	if (document.form1.txtto.value=="")
    {
      alert("Please Enter Sectors - To" );
      document.form1.txtto.focus();
      return false;
    }
	if (document.form1.txtpersons.value=="")
    {
      alert("Please Enter Number of Persons" );
      document.form1.txtpersons.focus();
      return false;
    }	
	if (document.form1.txtphone.value=="")
    {
      alert("Please Enter Telephone Number" );
      document.form1.txtphone.focus();
      return false;
    }
		if (isNaN(document.form1.txtphone.value))
    {
      alert("Telephone Number should be an integer" );
      document.form1.txtphone.focus();
      return false;
    }	

	 if (document.form1.txtemail.value=="")
    {
      alert("please enter your Email Id" );
      document.form1.txtemail.focus();
      return false;
    }
 if (invalidemail(document.form1.txtemail.value))
    {
	  alert("Email address should be of type 'abc@pqr.some extention' ");
       document.form1.txtemail.focus();
       return false;
    }
return true;
}


//Hotel Booking

function chk_hotel(){
if (document.form1.txtname.value=="")
    {
      alert("Please Enter Name " );
      document.form1.txtname.focus();
      return false;
    }
	if (document.form1.txtplace.value=="")
    {
      alert("Please Enter Place" );
      document.form1.txtplace.focus();
      return false;
    }
	if (document.form1.adults.value=="")
    {
      alert("Please Enter No of Persons" );
      document.form1.adults.focus();
      return false;
    }
	if (document.form1.txtsingle.value=="" && document.form1.txtdouble.value=="" && document.form1.txttriple.value=="")
    {
      alert("Please Enter No of Rooms needed" );
	  document.form1.txtsingle.focus();
      return false;
    }

	if (document.form1.txtacc.value=="")
    {
      alert("Please Enter Type of accomodation needed" );
	  document.form1.txtacc.focus();
      return false;
    }

	if (document.form1.txtphone.value=="")
    {
      alert("Please Enter Telephone Number" );
      document.form1.txtphone.focus();
      return false;
    }
		if (isNaN(document.form1.txtphone.value))
    {
      alert("Telephone Number should be an integer" );
      document.form1.txtphone.focus();
      return false;
    }	

	 if (document.form1.txtemail.value=="")
    {
      alert("please enter your Email Id" );
      document.form1.txtemail.focus();
      return false;
    }
 if (invalidemail(document.form1.txtemail.value))
    {
	  alert("Email address should be of type 'abc@pqr.some extention' ");
       document.form1.txtemail.focus();
       return false;
    }
return true;
}


function invalidemail(s)
{
  res=0;
  len=s.length;

   for(i=0;i<len;i++)
     { 
       if(s.charAt(i)=='@' )
	 
   for(j=i;j<len;j++)
            {
              if(s.charAt(j)=='.')
                  res=1;
	
             }
     }  
if (res==0)
    return true; 
  else
     return false; 
}

//Date function

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
}