Achieving transparency

Using css opacity property

• The whole element becomes transparent. Usefull in some cases, a big problem otherwise.

Using rgba colors

• Works fine in modern browsers (FF 3.5, Opera 10, Chrome 2 and Safari 4).
• No luck in Internet Explorer. Furthermore, using the MS filter results in buggy behavior when setting it to 100%.

Using transparent pngs

• Works fine in all modern browsers except ie6.