//获取URL参数               
function getParam(paramName)
{
    paramValue = "";
    isFound = false;
    if (this.location.search.indexOf("?") == 0 && this.location.search.indexOf("=") > 1)
    {
        arrSource = unescape(this.location.search).substring(1, this.location.search.length).split("&");
        i = 0;
        while (i < arrSource.length && !isFound)
        {
            if (arrSource[i].indexOf("=") > 0)
            {
                if (arrSource[i].split("=")[0].toLowerCase() == paramName.toLowerCase())
                {
                    paramValue = arrSource[i].split("=")[1];
                    isFound = true;
                }
            }
            i++;
        }
    }
    return paramValue;
}

------解决方案--------------------

http://www.cnblogs.com/dachie/archive/2010/09/16/1827840.html