function validate(){
	var check = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
	var email = document.getElementById("email").value;
	if(check.test(email) == false) {
		alert('Enter the Valid Email Address');
		document.getElementById("email").value="";
		document.getElementById("email").focus();
		return false;
	}
	
	var AD_number = document.getElementById('AD_number').value;
	if(AD_number==""){
		alert("Enter the AD Number");
		document.getElementById('AD_number').focus();
		return false;
	}		
	return true;
}

function alpha(){
	var check = /^[A-Za-z]$/;
	var email = document.getElementById("email").value;
	if(check.test(email) == false) {
		alert('Enter the Valid Email Address');
		document.getElementById("email").value="";
		document.getElementById("email").focus();
		return false;
	}
}
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					
	}

function validates()
{
	
	if(document.getElementById('txtname').value=='')
	{
		alert("Please Specify Your name");
		document.getElementById('txtname').focus();
		return false;
	}
	var check = /^([A-Za-z]+)$/;
	var names = document.getElementById("txtname").value;
	if(check.test(names) == false) {
		alert('Please Enter Valid Character');
		document.getElementById("txtname").focus();
		return false;
	}
	if(document.getElementById('txtphone').value != '')
	{
		var phone = document.getElementById('txtphone');
		if (checkInternationalPhone(phone.value)==false){
		alert("Please Enter a Valid Phone Number")
		//Phone.value=""
		phone.focus()
		return false;
	   }
	}	
	var emailID=document.getElementById('txtmail');
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Specify your Email ID")
		emailID.focus()
		return false;
	}
	if (echeck(emailID.value)==false){
		emailID.focus()
		return false;
	}
	if(document.getElementById('txtcomment').value=='')
	{
		alert("Please Specify Your Comments");
		document.getElementById('txtcomment').focus();
		return false;
	}
	
}


/**
 * 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 trim(s)
{   var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not a whitespace, append to returnString.
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (c != " ") returnString += c;
    }
    return returnString;
}
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){
var bracket=3
strPhone=trim(strPhone)
if(strPhone.indexOf("+")>1) return false
if(strPhone.indexOf("-")!=-1)bracket=bracket+1
if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return false
var brchr=strPhone.indexOf("(")
if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return false
if(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return false
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}




function logins()
{
	if(document.getElementById('username').value=='')
	{
		alert("Please Specify User name");
		document.getElementById('username').focus();
		return false;
	}
	if(document.getElementById('passwd').value=='')
	{
		alert("Please Specify Password");
		document.getElementById('passwd').focus();
		return false;
	}
}