thanks i done it

Code: 
<html>
<head>
<script type="text/javascript">
function CheckMyEmail()
{
var x=document.forms["myForm"]["email"].value;
var value=("BC102034568");
var at=x.indexOf("@");
var dot=x.lastIndexOf("vu.edu.pk");
if (at<1 || dot<at+1 || dot+2>=x.length)
{
alert("This is Not your valid VU e-mail address");
return false;
}
else
{
    if(x=="BC102034568@vu.edu.pk")
        {
        alert("This is your valid VU e-mail address");
        return false;
        }
else
{
alert("not an valid email address");
return false;
}
}
}
</script>
</head>

<body>
<form name="myForm" action="example.html" onsubmit="return CheckMyEmail();" method="post">
Email: <input type="text" name="email">
<input type="submit" value="Submit">
</form>
</body>

</html>
now i wanna add some more function it it the alert box

There must be unique alerts for each error; like if the length of the student ID is larger or smaller than the original ID then the alert should be according to that.
sahil00150 Reviewed by sahil00150 on . Help Need In Making Assisgnment JavaScript Hello i got assignment from my university i am not able to make it properly doing some mistakes well got this assignment Make a form in HTML document containing only one field named as Email and one Submit Button. Write your own JavaScript function to validate the email address. The Validation should be as follows: It must accept only your VU Student email address i.e; it must not accept any other student’s VU email address. Rating: 5