question marks on some applications in dock

[marko1011]

Hi, when i opened my macbook today, i noticed that when i clicked on mail, there was ablack question mark over it, then i tried to open photo booth and aperture but the same thing happened, safari, itunes, pages and some other apps are working but some aren't. i verified and repaired disk permissions and searched for the broken apps in the finder but they're not there. please help...

 

[Gregg2]

That means the apps have either been moved or deleted. The Dock "shortcuts" are pointing to the Applications Folder. Put them apps back in there if you find them, then all will be well. If not found, you will have to reinstall them.