// JavaScript Document
function validateForm()
{
	if(document.form1.fname.value=='')
	{
		alert("Please enter First Name");
		document.form1.fname.focus();
		return false;
	}
	if(document.form1.lname.value=='')
	{
		alert("Please enter Last Name");
		document.form1.lname.focus();
		return false;
	}
	if(document.form1.email.value=='')
	{
		alert("Please enter E-mail");
		document.form1.email.focus();
		return false;
	}
	else
	{
		str=document.form1.email.value;
		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")
		   document.form1.email.focus();
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   document.form1.email.focus();
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
			document.form1.email.focus();
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
			document.form1.email.focus();
		    return false
		}

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
			document.form1.email.focus();
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
			document.form1.email.focus();
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
			document.form1.email.focus();
		    return false
		 }
	}
	if(document.form1.phone1.value=='')
	{
		alert("Phone number should be at least ten digits including area code or country/city code");
		document.form1.phone1.focus();
		return false;
	}
	else
	{
		phno=checkInternationalPhone(document.form1.phone1.value)
		if(phno==false)
		{
			alert("Phone number should be at least ten digits including area code or country/city code");
			document.form1.phone1.focus();
			return false;
		}
	}
	return true;
}


/**
 * DHTML phone number validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */

// 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 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);
//alert(isInteger(s));
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}