How do I diusable the install notifications?

I recently got a myTouch 4G and I,love it except that every time I download an app the notification stays there for days! I want to get rid of that notification but I want to keep the "New Voicemail" notifications and "New Text Message" notifications. I can't delete them singularly all I can see is a "Clear Notifications" button that wipes out all the notifications.

I don' even care if they come up, so long as I can get rid of them and not the other, actual important, notifications.

Tom P.