*** HTML Programming question *** no php at all...

Sorry if someone takes that as an offtopic but, I can't find good HTML/Javascript programming lists, if someone can point it out any I'd apreciate it a lot.And haven't been able to find any reference to my problem even searching for hours in google. And the question here it goes, I've got a page with a header, the header is a layer floating around the page, with Explorer I've no problem but with Netscape, voilà, when the layer passes over a textbox, select or some other typical form widget, the widget remains over the layer. I've tried all the possible combinations with z-index with no result. There's any workaround to this?, I'm stuck. Thank you very much in advance, and sorry if this is an offtopic.