validate email address using javascript

function isEMailAddr(elem) {
var str = elem.value;
//alert(str);
var re = /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/;
if (!str.match(re)) {
//alert("false");
//setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
return 1;
} else {
//alert("true");
return 0;
}
}