//QQ滚动
var contact = document.getElementById("divContact");
var _left = (document.body.clientWidth - 1003)/2+1003-140;
contact.style.left = _left +'px';
function contact_close()
{
   if(window.detachEvent)
      window.detachEvent('onscroll',contact_scroll);
   else
      window.removeEventListener("scroll",contact_scroll,true); 

   contact.style.visibility='hidden';
}

function contact_scroll()
{
   window.setTimeout("contact_move()",1);
}
function contact_move()
{
   contact.style.top = 420 + document.documentElement.scrollTop + "px";
}


if(window.attachEvent)                        
   window.attachEvent("onscroll",contact_scroll);             //ie注册事件
else
   window.addEventListener("scroll",contact_scroll,true);     //ff注册事件