// JScript 文件
var imagePath = "/UserControls/ImageValidate.aspx";
function ImageCommon() {
}

ImageCommon.prototype.Image = function(obj){
    var s = "<img src='"+ imagePath +"' alt='点击切换验证码图片' id='ImageCheck' height='30px' width='150px' ";
    s += " onclick=\"javascript:ChangeCodeImg();\" align='absBottom'/>";
      s += "<span style='cursor:hand'  onclick=\"javascript:ChangeCodeImg();\">换张图片</span>"

      obj.innerHTML = s;
}

  function ChangeCodeImg()
{ 
   var ic = new ImageCommon();
   ic.Image(document.getElementById("CheckImage"));   
  
}