Floating email cursor javascript.
Our web spider found the following code snippet at www_hypergurl_com and contains information about atan2 and JavaScript. 
atan2(Y,X)*180/Math.PI);
if (angle < 0) angle += 360;

y = Math.round(speed*Math.sin(angle*Math.PI/180));x = Math.round(speed*Math.cos(
angle*Math.PI/180));

dy+=y;dx+=x;                                                                    


if ((dy > my-speed*2) && (dx > mx-speed*2) && (dy < my+
speed*2) && (dx < mx+speed*2))
{clearTimeout(tmr);layer.visibility=off;}
else{layer.visibility=on;layer.top=dy;layer.left=dx}
tmr=setTimeout('stalk()',10);
stalk();
//-->
</script>
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