function CheckEmail() {
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	this.check = check;
	this.checks = checks;
	
	function check(email) {
		if (filter.test(email)) {
			return true;
		}
		else {
			return false;
		}
	 }
	 
	 function checks(emails) {
	 	emails = emails.split(',');
		var check_ = true;
		for (var index = 0; index < emails.length; index ++) {
			if (!filter.test(emails[index])) {
				check_ = false;
				break;
			}
		 }
		 return check_;
	 }
}