function isValidChars(strTest) {

	strValidChars = "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_@.?!,";
	
	var i = 0;
	for (i = 0; i < strTest.length; i++) {
		if (strValidChars.indexOf(strTest.charAt(i)) == -1) {
			i = strTest.length;
			return false;			
		}
	}
	return true;
}

//--------------------------------------------------------------------
function FillEmpty(objToTest, strReturn) {
	if (objToTest.value == "") {
		objToTest.value = strReturn
	}
}