var num;

function rand_adjust() {
	num = Math.floor(Math.random()*4240);
	document.all["tiptop"].style.backgroundPosition=num+"px center";
	slide();
}

function slide() {
	num = num - 1;
	document.all["tiptop"].style.backgroundPosition=num+"px center";
	setTimeout("slide()", 50);
}

function center() {
}