/*广告滚动*/
var $=function(id){return document.getElementById(id);}
var scroll_pixel,div_pixel,gtpos,gbpos,loop,moving_spd;
var top_margin = 50;         
var top_margin2 = 50;      
var speed = 10;                 
var speed2 = 10;          
var moving_stat = 1;  

var expires=3;
var text="";

function check_scrollmove()
{ 
       var div_id=$('sroll_div');
		scroll_pixel = document.documentElement.scrollTop;
        gtpos = scroll_pixel+top_margin;
        gbpos = scroll_pixel+top_margin2;
        if(parseInt(div_id.style.top) < gtpos)
        { 
         moving_spd = (gbpos-parseInt(div_id.style.top))/speed;
         div_id.style.top = parseInt(div_id.style.top)+moving_spd+"px";    
        }
        if(parseInt(div_id.style.top) > gtpos)
        {
         moving_spd = (parseInt(div_id.style.top)-gtpos)/speed;
         div_id.style.top = parseInt(div_id.style.top)-moving_spd+"px";
        }
        loop = setTimeout("check_scrollmove()",speed2);
}
check_scrollmove();