====== getRectImage ======
Returns image of the specified  area of the browser window.
===== Syntax =====
<code javascript>getRectImage = function(aLeft, aTop, aRight, aBottom);

getRectImage = function(aRect);</code>
==== Parameters ====
   * **//aLeft//** 
    * //functions:// X coordinate of the upper-left corner of the rectangular area relative to browser window
  * **//aTop//** 
    * //functions:// Y coordinate of the upper-left corner of the rectangular area relative to browser window
  * **//aRight//** 
    * //functions:// X coordinate of the lower-right corner of the rectangular area relative to browser window
  * **//aBottom//** 
    * //functions:// Y coordinate of the lower-right corner of the rectangular area relative to browser window
  * **//aRect//** 
    * //functions:// rectangle, area of which has to be obtained in the image
==== Returned value ====
  * //functions:// image of the specified area

===== Examples =====
  -<code javascript>//Load a page with image (in this case - captcha)
loadURI('http://www.google.com/recaptcha/learnmore');
//Get an element, containing the image
var imageElement = getElement('img',0,['src'],['google.com/recaptcha/']);
//Get an element rectangle
var imageRect = getElementRect(imageElement);
//Get the image of the rectangle area
var image = getRectImage(imageRect);
//Deduce to the log  the color of image pixel  with coordinates (10,10)
log(image.pixels[10][10]);</code>