Specific Swap Usage

Hi,

is there any way to look what programs are swapped out and how much 
memory they use? Looking at SIZE in top is just a wild guess. One server 
here grows in swap usage and panics eventuelly when all swap is usage. 
Swap usage is growing slowly (100 MB /week ) but it is growing and see 
no way to get what really uses swap :( (Read man ps three times already :/)

Arne