[texhax] Column specifier question

[Yiqing Jin (Denny)]

Hi!

Sorry for the trouble, but I am having a bad time building up tables. To 
be specific, I need to give the columns some certain widths while at the 
same time requiring the text to be centre aligned. I have tried the 
\begin{tabular}{c c c c c}, and also the \begin{tabular}{... p{24mm} 
...} commands, but how can I get them to work at the same time?

Thank you!