/*
author:char
date:2009.12.1
*/
if(typeof $ =="undefined"){
var $=function(id){
    return document.getElementById(id);
}
}
String.prototype.Trim = function()
{ 
    return this.replace(/(^\s*)|(\s*$)/g,""); 
}
function checkLogin(){
try{
    var rg1=/^[0-9a-zA-Z_]{4,30}$/;
    var rg2=/^[0-9a-zA-Z_]{6,16}$/;
    var rg3=/^[0-9a-zA-Z]{5}$/;
    if(!rg1.test($("log_txtName").value.Trim())){
        alert("该登录名不存在");
        return false;
    }else if(!rg2.test($("log_txtPass").value.Trim())){
        alert("密码错误");
        return false;
    }else if(!rg3.test($("log_txtCode").value.Trim())){
        alert("验证码错误");
        return false;
    }else{return true;}
  }catch(e){
    return false;
  }
return false;
}