function CheckDomainNameChars(strName, objField, strErrMsg) {
	var result = true;
	var patern = /[abcdefghijklmnopqrstuvwxyz0123456789-]/;
	var s = strName.toLowerCase();
	
	if (s == "") {
		result = false;
	} else {
		for(i=0; i < s.length; i++) {
			if(s.charAt(i).search(patern)==-1) {
				result = false;
			}
		}
	}

	if (!result) {
		alert(strErrMsg);
	}
	objField.value = s;
	return result;
}