Well i heard i could make transparency with PNG file format, but even if i manage to set the image's transparence to something like 50%, it still shows as if it was not transparent when i include it on a page and see this page in the browser. (sorry for my loosy english, i hope you understood)

It's like a transparent GIF. Either totally transparent, or not transparent at all. That's a pity, because i planned on making cool transparency effects with this promising PNG format.

Or maybe my browsers are too old. I tried on IE 5.0 and NS 4.7, not on the latest Mozilla yet.

Anybody managed to get the 50% transparency work correctly in a browser ?
Maybe there's something i forgot when i created the PNG file. So if you got a tip, on PhotoShop or GIMP, help is welcome !