function checkEmailForm(id){
		var emailInput = document.getElementById(id);
		if (!emailInput) return false;
		if (!checkEmailText(emailInput.value)){
			alert ('Invalid email format.');
			return false;
		}
		emailInput.focus();
	}
	
	function checkEmailText(email){
		if (!email) return false;
		var emailpattern = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/
		return emailpattern.test(email);
	}
	
	function openLabel(filename, autoclose, width, height){
		window.open(filename, 'compWindow', 'width=' + width + ',height=' + height + 'resizable=no, menubar=no');
	}