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Our web spider found the following code snippet at www_dhtmlcentral_com and contains information about atan and JavaScript.
atan(x,y)); 
dx = round(v * cos(degToRad(a))); 
dy = round(v * sin(degToRad(a))); 
this.moveBy(dx,dy); 

setTimeout(this.name + ".slide(" + xx + "," + yy + ", '" + func + "');",10);    
 
// Preoading the windows filters. 

if (menuCount==0 && document.all) document.all[this.ref].style.filter = "alpha (
opacity=100)"; 
menuCount++; 
return this; 
// Math functions 
//================ 
var pi = Math.PI; 
function square(x) { return (x*x); } 
function sqrt(x) { return Math.sqrt(x); } 
function round(x) { return Math.round(x); } 
function rand(x,y) { return (round(Math.random()*(y-x)) + x); } 
function cos(x) { return Math.cos(x) } 
function sin(x) { return Math.sin(x) } 
function degToR
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