In my html page I have put a background image. Now I need a simple rectangular box, where I will put in my rest of the html stuff.

I need it something like the example webpage shown here. I am somehow able to put the background image, but I don't know how to create the white backgrounded space where rest of the html stuff is there

example is here http://www.foxtab.com/1.3/d/

can anyone help me say how to put this rectangular shape on top of my background image.