function scroll(id,min,max,step){
el=document.getElementById(id);
left=el.style.left.replace("px","").valueOf();
left=step+left.valueOf()*1;
if (left>=max) left=min;
el.style.left=left+"px";
}
function scroll_all(timeout){
scroll ("div1",-2089,2089,1);
scroll ("div2",-2089,2089,1);
setTimeout (function (){scroll_all(timeout);},timeout);
}
scroll_all(10);