validar email

[emprear]

Código Javascript:

<script type="text/javascript">
//<![CDATA[
var elEmail1 ="[email protected]";
var elEmail2 ="[email protected]";
var elEmail3 ="[email protected]";
var emailReg =/^[a-z0-9\._-]+@+[a-z0-9\._-]+\.+[a-z]{2,4}$/i;
if(!emailReg.test(elEmail1)) {
alert('error1');
}
if(!emailReg.test(elEmail2)) {
alert('error2');
}
if(!emailReg.test(elEmail3)) {
alert('error3');
}
//]]>
</script>
 

saludos