Email validation

checking email validation by java script.
aspx page
<script language=”javascript” type=”text/javascript”>
function checkmail()
{
var emailfilter = /^\w+[\+\.\w-]*@([\w-]+\.)*\w+[\w-]*\.([a-z]{2,4}|\d+)$/i
     var MailID = document.getElementById(‘txtMailID’);
     var returnval=emailfilter.test(MailID.value)
     if (returnval==false)
      {
         alert(“Please enter a valid email address.”);
        MailID.focus();
      }
     return returnval;
}
<script>
<asp:Button ID=”btnSubmit” runat=”server” Text=”Submit” />
then add an attribute in codebehind file to submit buttion
 btnSubmit.Attributes.Add(
“OnClick”, “return checkmail();”) 
 its equal to email validator in .net

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