function validate_email(field,alerttxt) {
	with (field) {
		apos=value.indexOf("@");
		dotpos=value.lastIndexOf(".");
		if (apos<1||dotpos-apos<2){alert(alerttxt);return false;}
		else {return true;}
	}
}

function validate_form(thisform) {
	with (thisform) {
		if (validate_email(email,"Not a valid e-mail address!")==false)
			{email.focus();return false;}
		}
}