// JavaScript Document
function chkValidStr(checkStr,validStr){

	var err = false
	if(validStr == "" || validStr == undefined){
	 	validStr ="0123456789_qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM"
	}
	var listStr = checkStr.split("")
	for(var i = 0;i < listStr.length;i++)	{
		if(validStr.indexOf(listStr[i])< 0 || validStr.indexOf(listStr[i])>= validStr.length){
			err = true
			break
		}
	}
	return !err
}