function ValidateForm(){
//check for blank firstname
	var firstname=document.mail.First_Name
	if ((firstname.value==null)||(firstname.value=="")||(firstname.value=="First Name")){
		alert("Please Enter your First Name")
		firstname.focus()
		return false
	}
	
//check for blank lastname
	var lastname=document.mail.Last_Name
	if ((lastname.value==null)||(lastname.value=="")||(lastname.value=="Last Name")){
		alert("Please Enter your Last Name")
		lastname.focus()
		return false
	}
	
	var Email=document.mail.Email
	
	if ((Email.value==null)||(Email.value=="")){
		alert("Please Enter your Email Address")
		Email.focus()
		return false
	}
	if (echeck(Email.value)==false){
		Email.value=""
		Email.focus()
		return false
	}
	
	//check for blank phone
	var phone=document.mail.Phone
	if ((phone.value==null)||(phone.value=="")||(phone.value=="Phone")){
		alert("Please Enter your Phone Number")
		phone.focus()
		return false
	}
	
	//check for blank company
	var company=document.mail.Company
	if ((company.value==null)||(company.value=="")||(company.value=="Company")){
		alert("Please Enter your Company Name")
		company.focus()
		return false
	}	
	//check for blank Website
	var website=document.mail.Website
	if ((website.value==null)||(website.value=="")||(website.value=="Website")){
		alert("Please Enter your Website Address")
		website.focus()
		return false
	}	
	//check for blank How Heard
	var howheard=document.mail.How_Found
	if ((howheard.value==null)||(howheard.value=="")){
		alert("Please Enter your Phone Number")
		howheard.focus()
		return false
	}			
	
	return true
		
//check for valid phone
// Declaring required variables
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 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 Address")
		   return false
		}

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

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

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

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

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

	var Phone=document.mail.Phone
	
	if ((Phone.value==null)||(Phone.value=="")){
		alert("Please Enter a Valid Phone Number")
		Phone.focus()
		return false
	}
	if (checkInternationalPhone(Phone.value)==false){
		alert("Please Enter a Valid Phone Number")
		Phone.value=""
		Phone.focus()
		return false
	}
 }