====== MouseDown ======
Emulates pressing of the left mouse button in the current coordinates of the cursor on the page.
===== Syntax =====
<code pascal>procedure MouseDown;</code>

===== Examples =====
  -<code pascal>LoadURI('google.ru');
//Obtain a random element with tag "input"
var element:=GetElement('input');
//Emulate mouse movement to a position (550,5) of element
MoveToElement(element,0,0,550,5);
//Emulate  the pressing of the  left mouse button
MouseDown;
//Emulate the releasing of the left mouse button
MouseUp;</code>