<!--Scroller script begins-->

function movedown(divname,divheight){
var crossobj=document.getElementById(divname)
var contentheight=crossobj.offsetHeight
if (parseInt(crossobj.style.top)>=(contentheight*(-1)+divheight))
crossobj.style.top=parseInt(crossobj.style.top)-19
//alert(crossobj.style.top);
}
function moveup(divname,divheight){
var crossobj=document.getElementById(divname)
var contentheight=crossobj.offsetHeight
if (parseInt(crossobj.style.top)<0)
crossobj.style.top=parseInt(crossobj.style.top)+19
//alert(crossobj.style.top);
}

<!--Scroller script ends-->