function jsECheck(str) {
	var aResult = true;
	var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (str != "") {
		if (filter.test(str)) {
			aResult = true;
		}
		else {
			aResult = false;
		}
	}
	else {
		aResult = false;
	}
	return (aResult)
}