// Thanks to http://www.bennadel.com/blog/950-jQuery-Plugin-To-Make-It-launch.htm
jQuery.fn.launch = function(){
// Loop over each of the elements in the jQuery 
// stack so that we can set up the properties
// for the individual elements.
	this.each(
		function( intI ){
			// Get a jQuery object for this element.
			var jNode = $( this );
			// Default plugin to not be vibrating.
			var blnlaunch = false;
			// Get current position of the element.
			var intLeft = parseInt( jNode.css( "left" ) );
			var intTop =  parseInt( jNode.css( "top" ) );
			// Create a function pointer that will 
			// handle the updating of elements position
			// such that it will make it appear to be
			// vibrating.
			var fnUpdatePosition = function(){
				var intCurrentLeft = parseInt(jNode.css( "left" ));
				var intCurrentTop = parseInt(jNode.css( "top" ));						
				// Check to see if we should keep going.
				if (blnlaunch){
				// Check to see which direction to 
				// adjust in - either vert. or horz.
				if (Math.random() > .5){
				// Adjust vertically.
				if (intCurrentTop > intTop){
					intCurrentTop = (intTop - 2);
					} else {
					intCurrentTop = (intTop + 2);
					}
					} else {
				// Adjust horizontally.
				if (intCurrentLeft > intLeft){
					intCurrentLeft = (intLeft - 2);
					} else {
					intCurrentLeft = (intLeft + 2);
					}
				}
				// Set a timeout to call this method
				// again and update position.
				setTimeout(fnUpdatePosition,60);
				} else {
				// Reset position.
				intCurrentLeft = intLeft;
				intCurrentTop = intTop;
				}
			// Update the position.
			jNode.css("top", (intCurrentTop + "px"));
			jNode.css("left", (intCurrentLeft + "px"));
			}			
			// Hoook up the mouse over event to flag 
			// that the vibrating should begin.
			jNode.mouseover(function(){
				// Flag vibration.
				blnlaunch = true;
				// Start vibrating.
				fnUpdatePosition();
				}
			);
			// Hook up the mouse out event to flag
			// that the vibrating should end.
			jNode.mouseout(function(){
			// Clear vibration.
				blnlaunch = false;
				}
			);
		}
	);
	// Return the jQuery stack to keep chaining.
	return( this );
	}
	// Hook up all the vibration properties.
	$(function(){
		$( "div.image" ).launch();
	}
);