flash (macromedia): I have an animation here: http://masencolisionesyaccesorios.com/
I used the wmode, transparent which had worked fine in other cases but not now, it's only working in IE 6, can anyone tell me why?

check your html

param tag is for IE
<param name="wmode" value="transparent">

for mozilla/netscape, you need to set the wmode attribute in embed
<embed src="masflash2.swf" quality="high"
pluginspage="http://www.macromedia.com/go/getflashplayer"
type="application/x-shockwave-flash" width="829" height="445"
wmode="transparent"></embed>