function IsEmailAddress(mail){
	
	var addressPattern = /^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/;
	return addressPattern.test(mail);
}

function ValidChars(e, goods) {
	
	var key, keychar;
	key = (window.event) ? window.event.keyCode : ((e) ? e.which : null);
	if (key == null) return true;
 
	keychar = String.fromCharCode(key);
	keychar = keychar.toLowerCase();
	goods = goods.toLowerCase();
 
	if (goods.indexOf(keychar) != -1)
		return true;
 
	if (key==null || key==0 || key==8 || key==9 || key==13 || key==27)
		return true;
 
	return false;
}