====== mouseWheel ======
Emulates a mouse wheel scrolling.
===== Syntax =====
<code javascript>mouseWheel = function(aDeltaX, aDeltaY);</code>

===== Notes =====
  * **//aDeltaX//** 
    * //functions:// number of pixels to scroll horizontally
  * **//aDeltaY//** 
    * //functions:// number of pixels to scroll vertically
===== Examples =====
  -<code javascript>loadURI('habrahabr.ru');
for (var i = 0; i < 9; i++){
  mouseWheel(0,-100);
  wait(200);
}</code>