function check_form(fm)
{
	var errs;
	eml = fm.email;
	if(!is_email(eml.value))
	{
		alert("Please enter a valid email address.\n\ne.g. yourname@example.com\n");
		eml.select();
		return false;
	}
	return true;
}

function is_email(strValue)
{
	var objRegExp  = /^[a-z0-9]([a-z0-9_\.]*)@([a-z0-9_\.]*)(\.[a-z]{2,4})(\.[a-z]{2})*$/i;
	return objRegExp.test(strValue);
}