Har ett bra exempel åt dig från ett nytt inlägg från smashing magazine..
They way you describe works, but going to those lengths is probably unnecessary. If the background of the div is an image, you could lower its opacity in Photoshop and save it as an alpha-transparent PNG (PNG-24 in Photoshop). Then use that PNG as your background image. You’ll need PNG hack for IE 6. If you have a solid-color background, you could use a repeating 1×1 pixel alpha-transparent PNG of that color, or use RGBa
http://www.smashingmagazine.com/2009/04/17...ds-positioning/
Scrolla ner lite..