var bName = navigator.appName;
var bVer = parseInt(navigator.appVersion);
var NS4 = (bName == "Netscape" && bVer >= 4);
var IE4 = (bName =="Microsoft Internet Explorer" && bVer >= 4);
var NS3 = (bName == "Netscape" && bVer < 4);
var IE3 = (bName =="Microsoft Internet Explorer" && bVer < 4);
if (NS4 || IE4){
    if (bName == "Netscape"){
	layerStyleRef="layer.";
	layerRef = "document.layers";
	styleSwitch = "";
    } else {
	layerStyleRef="layer.style.";
	layerRef = "document.all";
	styleSwitch = ".style";
    }
}

var objektname = "sprite";
var first = 1;
var posx = 0;
var posy = 0;
var stepx = 3;
var stepy = 1;

function scroll()
{
    if (first==1) {
      eval(layerRef+'["'+objektname+'"]'+styleSwitch+'.left=-150');
      eval(layerRef+'["'+objektname+'"]'+styleSwitch+'.top=0');
      first = 0;
    }
    eval(layerRef+'["'+objektname+'"]'+styleSwitch+'.left='+posx);
    eval(layerRef+'["'+objektname+'"]'+styleSwitch+'.top='+posy);
    if((posy+=stepy)>700 || posy<0) stepy=-stepy;
    if((posx+=stepx)>600) {
	stepx= Math.random()*3+2;
	stepy= Math.random()*4-2;
	posx = -150;
	posy = Math.random()*400+100;
    }
    timer=setTimeout('scroll()', 10);
}