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Validate email address in Javascript?

This is my first post and I have a small issue. I'm trying to validate an email address on a form, but with no luck. I found this snippet on the internet but it doesn't seem to be working. I'm using Javascript at the moment to validate it. I don't usually use JS, so any help would be appreciated.

<script type="text/javascript">
 function ValidateEmail(inputText) 
 { 
 var mailformat = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/; 
 if(inputText.value.match(mailformat)) 
 { 
 document.forms.emailform(); 
 return true; 
 } 
 else 
 { 
 alert("You have entered an invalid email address!"); 
 document.forms.emailform(); 
 return false; 
 } 
 } 

<?php
 $addemail .= '
 
 <form method="post" action="cart2.php" name="emailform" onsubmit="return validateEmail">
 ';
 $addemail .= '
 E-mail Address: <input type="text" name="email" value="'.$row6['email'].'" size="19" /><input type="hidden" name="cartid" value="'.$cart.'" />';
 if ( $emailerror != '' )
 {
 $addemail .= '<img src="images/email_error.png" width="16" height="16" hspace="4" alt="E-mail Error" />';
 }
 $addemail .= '
 <input type="image" name="Add E-mail Address" alt="Add E-mail Address" src="images/addemail.gif" style="vertical-align:middle" />
 </form>
 ';
 if ( $row6['email'] == '' )
 {
 $emailpresent = 0;
 }
 else
 {
 $emailpresent = 1;
 }
}
 $addemail .= '
 </td>
 </tr>
 ';
}
?>