.thumb {position: absolute; width: 100; height: 100; background-color: transparent; layer-background-color: transparent; z-index: 100000;}

#thumb1 {left: 30; top: 500;}
#thumb2 {left: 290; top: 500;}
#thumb3	{left: 550; top: 500;}
#thumb4 {left: 810; top: 500;}