Element.prototype.mv

@Description: Moves an element to a specific x, y and z position either absolutly or relatively is specified
@File: Element/prototype/mv.js
@Param: Number x The x position to move the element to
@Param: Number y The y position to move the element to
@Param: Number z The zIndex to move the element to
@Return: returns itself
@Example:

myElement.mv(200,200,999);
//move sthe node to absolute position 200,200 and a zIndex of 999