function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}
	
	var digits = "0123456789";     // non-digit characters which are allowed in phone numbers
var phoneNumberDelimiters = "()- ";   // characters which are allowed in international phone numbers
										// (a leading + is OK)
var validWorldPhoneChars = phoneNumberDelimiters + "+";   // Minimum no of digits in an international phone no.
var minDigitsInIPhoneNumber = 10;


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++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone){
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

function ValidateForm(){
	var emailID=document.frmSample.txtEmail;
	var fname=document.frmSample.txtfName;
	var lname=document.frmSample.txtlName;
	var phone=document.frmSample.txtPhone;
	var subject=document.frmSample.txtSubject;
	var message=document.frmSample.txtMessage;
	var invalid = " ";	

	if ((fname.value==null)||(fname.value==""))
	{			
		alert("Please Enter your First Name")
		fname.value=""
		fname.focus()	
		return false;		
	}
	
	if (fname.value.indexOf(invalid) > -1) 
			{
			alert("Sorry, spaces are not allowed in First Name.")
			fname.value=""
		    fname.focus()
			return false;
			}
			
	if ((lname.value==null)||(lname.value==""))
	{			
		
		alert("Please Enter your Last Name in Last Name.")
		lname.value=""
		lname.focus()	
		return false;		
	}
	
	if (lname.value.indexOf(invalid) > -1) 
			{
			alert("Sorry, spaces are not allowed.")
			lname.value=""
		    lname.focus()
			return false;
			}
		
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Enter your Email ID")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}

 
 if ((phone.value==null)||(phone.value=="")){
		alert("Please Enter your Phone Number")
		phone.focus()
		return false
	}
	
	if (checkInternationalPhone(phone.value)==false){
		alert("Please Enter a Valid Phone Number")
		phone.value=""
		phone.focus()
		return false
	}
	
	
	if ((subject.value==null)||(subject.value=="")){
		alert("Please Enter the Subject of your Message")
		subject.focus()
		return false
	}
	
	
	if ((message.value==null)||(message.value=="")){
		alert("Please Enter Text in the Message Box")
		message.focus()
		return false
	}
	
	return true
	
 }