Roaming Alien

Instructions:

1: Copy and paste the following script in the HEAD section of your page:
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var maxX=2;  // MAX HORIZ PIXEL STEPS
var maxY=2;  // MAX VERT PIXEL STEPS

var ns4=(document.layers)?true:false;
var ie4=(document.all && !document.getElementById)?true:false;
var ie5=(document.all && document.getElementById)?true:false;
var ns6=(document.getElementById&&navigator.appName.indexOf("Netscape")>=0)?true:false;
var w3c=(document.getElementById)?true:false;
var ww=0; var wh=0;
var ydir=true; var xdir=true;
var floatobj; 
var x=0; var y=0;
var stepX=1;
var stepY=1;

function getwindowsize(){
ww=(ie4||ie5)?document.body.clientWidth:window.innerWidth;
wh=(ie4||ie5)?document.body.clientHeight:window.innerHeight;
}

function randomdir(){
if(Math.floor(Math.random()*2))stepX=Math.floor(Math.random()*maxX)+1;
if(Math.floor(Math.random()*2))stepY=Math.floor(Math.random()*maxY)+1;
if(Math.floor(Math.random()*2))xdir=(Math.floor(Math.random()*2))?false:true;
if(Math.floor(Math.random()*2))ydir=(Math.floor(Math.random()*2))?false:true;
setTimeout('randomdir()', Math.floor(Math.random()*5000)+600);
}

function moveid(id,x,y){
if(ns4)id.moveTo(x,y);
else{
id.style.left=x+'px';
id.style.top=y+'px';
}}

window.onload=function(){
  floatobj=(ns4)?document.layers['floatobj']:(ie4)?document.all['floatobj']:document.getElementById('floatobj');
  floatobj.iw=(ns4)?floatobj.document.images["float"].width:document.images["float"].width;
  floatobj.ih=(ns4)?floatobj.document.images["float"].height:document.images["float"].height;
  if(ns6){
  floatobj.iw+=10;
  floatobj.ih+=10;
  } 
  getwindowsize();
  x=ww/2;
  y=wh/2;
  moveid(floatobj,x,y);
  randomdir();
  setInterval('animate()',50);
}

window.onresize=function(){
  if(ns4)setTimeout('history.go(0)',400);
  else getwindowsize();
}
</script>

2: Copy and paste the following style declaration in the HEAD section of your page:
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3: Copy and paste the following HTML anywhere in the BODY section of your page:
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4: Adjust the settings in the script to suit your needs