Controlling line thickness

[Don Isgitt]

Hello,

I am plotting a contour map using Mapserver; the data is in a line type 
shapefile. There is a feature in the dbf that describes the line 
thickness, so as to allow , say, every fifth contour to be thicker than 
the others (or, for that matter, to be a different color). The contour 
map is being drawn fine, but being able to "bold" certain lines would be 
much better. I have not found a parameter that allows me to control line 
thickness. How can I do this?

Thank you,

Don