How To Navigate Prev Next For Pictures ???

[Technos]

Hi There
I'm working on pictures. I'm reading Pictures using file system objects. The name of the pictures are in combo box and they are in one folder. I'm already displaying them if select from combo Now i have to create Prev and Next links for these pictures. I think I have to use arrays .. But how???? Help me pl.... Thanks.
Here is some of my code:

<div align=center>
<img src='

http://www.....com/Pictures/<;%=selEvent%>/<%=selPicture%>'>

</div>

from this i'm selecting pictures from different page.