You should be able to display the field like you would any any static web page. Try using this in your display:
<IMG SRC="http://URL/to/graphicsdirectory/nameofgraphic.gif">
I don't know if all your graphic will be .gif or .jpg or how you are entering the graphic name into your database?
Are you entering the filename and extension in that field?
Or are you entering the full path and the filename and extension for the images?
You could assign a variable within your .cfg file and call it something like:
$graphics_directory = 'http://yourserver.com/graphics';
and then you could use:
<IMG SRC="$graphics_directory/NAMEOFGRAPHIC">
If all your files were .jpg you could use:
<IMG SRC="$graphics_directory/$rec{$db_key}.jpg">
This will really depend on how you are entering the data into your image field.
Hope this helps.
Unoffical DBMan FAQ
http://webmagic.hypermart.net/dbman/