How to Validate Emain in Java script?

function validateEmail(obj)
{
var fld=0;
var goodEmail = obj.value.match(/\b(^(\S+@).+((\.com)|(\.net)|(\.edu)|(\.mil)|(\.gov)|(\.org)|(\..{2,2}))$)\b/gi);

fld = obj;

if (goodEmail)
{
good = true
}
else
{
alert("Please enter a valid email address.")
setTimeout("fld.focus();",1);
setTimeout("fld.select();",1);
good = false
}
return good;
}

The above function validates the email.