[рони]

onwion,

var a=5;
var b=300;
var n = 5;
function fn()
{
    a += 1;
    b += 100;
    window.scrollTo(a,b);
    n--;
    if(n > 0) window.setTimeout(fn, 30 * 1000)
}
window.setTimeout(fn, 30 * 1000);