I'm not sure if this will help, but I came across a similar
problem in making the interactive map at http://www.hcc.hawaii.edu/htbin/plotd.
If you want to send a value as well as an ismap x,y coordinate to a
server both at once, perhaps using an intermediate forms page can do the
trick. For instance, say I go to this URL by clicking on an ISMAP image:
http://server/htbin/mapthing?x,y
"mapthing" generates or shows a form where I can specify my
options, and when I submit it, it can have extra options as well as the
x, y coordinates. Something like:
http://server/htbin/mapthing?option1=yes&option2=no&x=23&y=42
and you can make the same server "mapthing" realize when it's
been passed just the coordinates only as well as name=value pairs, and
do the right thing in each case.
It's not great, but it works. Hope that helps!
-- Kevin