above and lower sliding banner accomplish

hello folks above and lower sliding banner code accomplish

// "
el_width=5
el_height=65
ns4=document.layers
ie4=document.all
ns6=document.getElementById&&!document.all
if (ns4){document.write(''+element+'')}
else{document.write(''+element+'')}
el_width_start=el_height_start=0
function el_move(){
if(ie4){ydiff=el_height_start-document.body.scrollTop; xdiff=el_width_start-document.body.scrollLeft}
else{ydiff=el_height_start-pageYOffset; xdiff=el_width_start-pageXOffset}
if(ydiff!=0){movey=Math.round(ydiff/10);el_height_start-=movey}
if(xdiff!=0){movex=Math.round(xdiff/10);el_width_start-=movex}
if(ns4){document.layers.element.top=el_height_star t+el_height;document.layers.element.right=el_width _start+el_width}
if(ie4){document.all.element.style.top=el_height_s tart+el_height;document.all.element.style.right=el _width_start+el_width}
if(ns6){document.getElementById("element").style.t op=el_height_start+el_height;document.getElementBy Id("element").style.right=el_width_start+el_width } }
elmove=setInterval("el_move()",15)
//-->