Layering or superimposing one object over other is an unique way of creating menus or displays, as showed in the following illustrations.
For example you want to label this image

 
step : 1 Copy the image or screen shot of untitled_3.htm, and paste it on the white (<body> <</body>). Then select layer tool to create floating label.  area
step 2: You can adjust the floating label over any object.

At end of playing with layer at this point came out like this illustrataion.