// JScript 文件
(function($){
$.fn.extend({ ScrollUpDown:function(opt,callback)
{
    var upHeight = $("#div_catelog").height() - $("#div_catelog_main").height();
    upHeight = 0 - upHeight;
   var movesize = 5;
   var timer = 100;
   var timerID;
   var currentMarginTop = 0; 
   
   
   MoveToTop=function ()
   {
      if(currentMarginTop > upHeight)
      {      
        currentMarginTop -= movesize;
        $("#div_catelog").animate({marginTop: currentMarginTop}, timer); 
        if($("#btn_up").attr("src") != "/images/0904/index/catelog_up.gif")  $("#btn_up").attr("src","/images/0904/index/catelog_up.gif");
      }
      else
      {
          $("#btn_down").attr("src","/images/0904/index/index_2.gif");
          $("#btn_up").attr("src","/images/0904/index/catelog_up.gif");
      }      
   }     
   
   MoveToDown=function()
   {
      if(currentMarginTop < 0)
      {  
          currentMarginTop += movesize;
          $("#div_catelog").animate({marginTop: currentMarginTop}, timer); 
           if($("#btn_down").attr("src") != "/images/0904/index/catelog_down.gif")  $("#btn_down").attr("src","/images/0904/index/catelog_down.gif");
      }
      else
      {
          $("#btn_up").attr("src","/images/0904/index/index_1.gif");
          $("#btn_down").attr("src","/images/0904/index/catelog_down.gif");
      }   
   }
   
   
  $("#btn_down").hover(
  function () {
    timerID=setInterval("MoveToTop()",timer);
  },
  function () {
    clearInterval(timerID);
  }).mouseout();
   
   
 
 //------------
  $("#btn_up").hover(
  function () {
    timerID=setInterval("MoveToDown()",timer);
  },
  function () {
    clearInterval(timerID);
  }).mouseout();
 
 //-----------
   
}      
})
})(jQuery);