// JavaScript Document
function check(a)
{
	if (a.name1.value==0)
	{
		alert("Enter Name");
		a.name1.focus();
		return false;
	}
	if (a.age.value==0)
	{
		alert("Enter Age");
		a.age.focus();
		return false;
	}
	if (isNaN(a.age.value))
			  {
				  alert("Only digits allowed");
				  a.age.value="";
				  a.age.focus();
				  return false;
			  }
	if (a.addr.value==0)
	{
		alert("Enter adderss");
		a.addr.focus();
		return false;
	}
	
	if (a.phone.value==0)
	{
		alert("Enter Phone number");
		a.phone.focus();
		return false;
	}
	
	if (isNaN(a.phone.value))
	{
		alert("Only digits are allowed");
		a.phone.value="";
		a.phone.focus();
		return false;
	}
	if(a.email.value==0)
	{
		alert("Enter E-Mail");
		a.email.focus();
		return false;
	}
		else
		{
		var atsignPos =a.email.value.indexOf("@", 0)
				if (atsignPos == -1) 
					{
	               		alert("Enter a valid Email-ID");
						a.email.value=""; 
		          		a.email.focus();
	               		return false;
					}
				if (a.email.value.indexOf(".", atsignPos) == -1)
					{           
	               		alert("Enter a valid Email-ID");
						a.email.value=""; 
		           		a.email.focus();
	               		return false;
	        		}
		}
		if (a.doa.value==0)
			{
				alert("Enter Arrival date");
				a.doa.value=""; 
				a.doa.focus();
				return false;
			}	
			var dtCh= "/";
var minYear=1900;
var maxYear=2100;

	var dt=document.feedback.doa
	if (isDate(dt.value)==false){
		dt.focus()
		return false
	}
//    return true


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 : mm/dd/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
	}

}

	
	if (a.nop.value==0)
			{
				alert("Enter No of persons");
				a.nop.value=""; 
				a.nop.focus();
				return false;
			}	
	if(isNaN(a.nop.value))
	{
			alert("Only digits allowed");
			a.nop.value="";
			a.nop.focus();
			return false;
	}			
	if (a.rr.value==0)
	{
			alert("Enter Rooms required");
			a.rr.value="";
			a.rr.focus();
			return false;
	}
	if (isNaN(a.rr.value))
	{
		alert("Only digits allowed");
		a.rr.value="";
		a.rr.focus();
		return false;
	}

	if (a.tor.value=="")
	{
			alert("Enter type of Room required");
			a.tor.value="";
			a.tor.focus();
			return false;
	}
	if (a.nod.value=="")
	{
			alert("Enter No of day to stay");
			a.nod.value="";
			a.nod.focus();
			return false;
	}
	if (isNaN(a.nod.value))
	{
		alert("Only digits are allowed");
		a.nod.value="";
		a.nod.focus();
		return false;
	}
}