Come tutelare da cookie questo script?

[sicurauto]

Ciao a utti
io ho questo script che visualizza un'immagine che fluttua sullo schermo e va via.
Come posso evitare che venga visualizzato sempre?
E' possibile mettere un cookie o una funzione random?
Grazie a chi mi aiuterà
Ciao!
Claudio

<DIV id=advsp_floatlayer style="Z-INDEX: 200;WIDTH: 80px;HEIGHT: 80px;POSITION: absolute;TOP: 100px;LEFT: -100px">
<a title="L'auto dei tuoi sogni?" target="_blank" href="http://clk.tradedoubler.com/click?p=26019&a=392385&g=14664161" onmouseover="if(timerID){clearTimeout(timerID)}" onmouseout="advsp_show(stp)">
</A></DIV>
<SCRIPT LANGUAGE="Javascript">
<!--
advsp_rolling=0;
advsp_x_pos=-100;
advsp_y_pos=100;
advsp_NAV=0;
advsp_IE=0;
advsp_VER = parseInt(navigator.appVersion);
var advsp_n = navigator.appName;
if (advsp_n.indexOf("Netscape")>=0) advsp_NAV=advsp_VER;
if (advsp_n.indexOf("Microsoft")>=0) advsp_IE=advsp_VER;
var advsp_route = Array(150,350,1,1,40,510,350,1,2,40,620,150,1,3,40,780,150,3,4,40,780,-100,10,5,40,-100,-100,5,6,40,-100,150,5,0,0);
var route_end = (advsp_route.length/5) -1
var stp
function advsp_move2(x,y,s) {
	var dx,dy;
    if ((advsp_NAV >= 4)||(advsp_IE >= 4)) {
	if ((x==advsp_x_pos)&&(y==advsp_y_pos)) return 1;
	dx=x-advsp_x_pos;
	if (dx<0) dx=-dx;
	dy=y-advsp_y_pos;
	if (dy<0) dy=-dy;
	if ((dx<1+s)&&(dy<1+s)) return 1;
		dx=(dx/40)+s;
		dy=(dy/40)+s;
	if (x>(advsp_x_pos+s)) advsp_x_pos=advsp_x_pos+dx;
	else if (x<(advsp_x_pos-s)) advsp_x_pos=advsp_x_pos-dx;
	if (y>(advsp_y_pos+s)) advsp_y_pos=advsp_y_pos+dy;
	else if (y<(advsp_y_pos-s)) advsp_y_pos=advsp_y_pos-dy;
        if (advsp_IE >= 4) {
                advsp_floatlayer.style.top=advsp_y_pos;
                advsp_floatlayer.style.left=advsp_x_pos;
        } else if (advsp_NAV == 4) {
                document.advsp_floatlayer.pageY=advsp_y_pos;
                document.advsp_floatlayer.pageX=advsp_x_pos;
        } else if (advsp_NAV == 5) {
		var o = document.getElementById("advsp_floatlayer");
		o.style.left=advsp_x_pos;
		o.style.top=advsp_y_pos;
	} else return 1;
        return 0;
    }
    return 1;
}
function advsp_show(s) {
	var apos,sleep;
	if ((s==-1)&&(advsp_rolling==1)) return;
	if (s==-1) {
		s=0;
		advsp_rolling=1;
	}
	if ((advsp_NAV>=4)||(advsp_IE>=4)) {
		stp=s;
		apos = stp * 5;
		sleep = 60;
		if (advsp_move2(advsp_route[apos],advsp_route[apos+1],advsp_route[apos+2]) == 1)
			{stp = advsp_route[apos+3]; sleep= advsp_route[apos+4];}
		if(stp!=route_end)
	{
	if (stp>=0)   timerID=setTimeout('advsp_show('+stp+')',sleep);
	}
	else if(timerID) clearTimeout(timerID);
	}
	}
	setTimeout('advsp_show(-1)',100);

	function OffSet()
	{
	if (navigator.appName=="Microsoft Internet Explorer")
   		offsetyPub = document.body.scrollTop;
	}

onscroll = OffSet;

//-->
</SCRIPT>