Email Validation

This JavaScript validate an email address before the user send it out. An email must have an @ character so the script will search for this character, if it is not found it will prompt the user to enter the email address again.

The Script is as follows:

<script language="javascript">

function sendMail(form){
var emailAdd
emailAdd=mailform.emailbox.value;
if (mailform.emailbox.value==""||mailform.emailbox.value.indexOf('@',0)==-1)// to search for the character @
alert("Please enter a valid email address");

else

location="mailto:"+ emailAdd;}
</script>
<form name="mailform" onsubmit="sendMail(this.form)">
email address:<input name="emailbox" type="text" value="">
<input type="submit" value="Send email">
</form>

Test it out here