var rnd={
  seed: (((new Date()).getTime()*9301+49297)%233280)/(233280.0),
  verifycode:function(){
     return "<img id='imglogin' onload=\"rnd.onload($('#btnlogin'))\" src=\""+webItems.rndurl+"\" style='cursor:pointer;vertical-align:top;margin-left:5px; ' onclick=\"rnd.verifyCode(this,$('#btnlogin'))\" title=\"点击更换验证码图片!\" />";
  },
  rand:function(value){
     return Math.ceil(this.seed*value);
  },
  verifyCode:function(img,btn){
     try{
       img.src=webItems.rndurl+"?"+this.rand(10000000);
       btn.disabled=true;
     }catch(e){}
  },
  onload:function(btn){
    try{
       btn.disabled = false;
    }catch(e){}
  }
}