You can make it more or less transparent by changing 0.50/50 (for before you hover) and 1.00/100 (for after you hover) to higher or lower numbers, working like percent. 0.01/1 is so transparent it's almost invisible, 1.00/100 is completely opaque, and so on. There are two different properties for the sake of crossbrowser compatibility (the regular opacity property doesn't work on Internet Explorer, so filter:alpha is there to make it work on IE), so keep the numbers between the properties the same so it looks the same on all browsers.
Also, please don't bump your thread in this forum, it's against the rules. This is a slow forum so bumps (unless the thread has fallen off the first page) are considered spam.