/*
 *函数功能：从href获得参数
 *sHref:   http://www.cscenter.com.cn/arg.htm?arg1=d&arg2=re
 *sArgName:arg1, arg2
 *return:  the value of arg. d, re
 */
  function GetArgsFromHref(sHref, sArgName)
  {
    var args  = sHref.split("?");
    var retval = "";
    
    if(args[0] == sHref) /*参数为空*/
    {
         return retval; /*无需做任何处理*/
    }  
    var str = args[1];
    args = str.split("&");
    for(var i = 0; i < args.length; i ++)
    {
        str = args[i];
        var arg = str.split("=");
        if(arg.length <= 1) continue;
        if(arg[0] == sArgName) retval = arg[1]; 
    }
    return retval;
  }