I suspect that I could use a primer or help with understanding how it is employed, if it is indeed how the following effect is achieved...
For example, look at this site... http://www.heidi-strobel.com/html/index.html
YES IT'S A CHEESY SITE... but it's the example I can quickly find... the background image is pretty well the whole site. There are several html elements "in front" of the background image. The source code on the page is a great deal of the DIV tag and a little javascript action.
When I copy the site code and load it up in a HTML editor ... all I get is the html elements occuring below the graphic... versus "in front" of the graphic.
Why ?? what's going on with this?