Shell Programming and Scripting

Hello everyone I am writing a cgi script in bash/html. I am trying something new with this one I have seperated the html code from the scripting. The html code is found in text files on the drive and the scripting is only one script in the cgi bin and i am using
"<select multiple name="state" size="4">
<option value="california" selected>" to change the page accounting to the state the user chooses. I do this using if statements/blocks and after they submit their choice it echos a text file and changes the page . I would like to do this with buttons as well but can't figure out how to make a button change the value of a variable. Anyone have any ideas?
Note: I am writing my sites in bash and html on a opensuse server
Thank you to anyone who response.

Check the value of the button in the POST or GET values and change what you want accordingly when the next webpage retrieval happens.

This is my start but I'm still a little confused this is what i hgave so far.

Code:

contact=`echo "$QUERY_STRING" | sed -n 's/^.*cm=\([^&]*\).*$/\1/p' | sed "s/%20/ /g"`
echo "<FORM><INPUT TYPE="submit" VALUE="Back" onClick="$contact=1"></FORM>"

how would set cintact to 1 or 0?

---------- Post updated at 10:35 PM ---------- Previous update was at 04:40 PM ----------

For anyone with the same problem I had who may be new to cgi scripts and like bash/html here is my solution I could not find much took me a while just playing with random code.

Code:

Line 1.
contact=`echo "$QUERY_STRING" | sed -n 's/^.*contact=\([^&]*\).*$/\1/p' | sed "s/%20/ /g"`
Line 2.
echo "<form method="get">"
Line 3.
echo "<INPUT TYPE="submit" NAME="contact" VALUE="1">" 
Line 4
echo "</form>"
use with if block/statement
if [ "$contact" = "1" ]; then
echo "<h1>YEA!</h1>
fi

I could not find anything straight forward and simple like that hopefully me posting it will help someone else.

Worth to mention this guide

Create a GCI using bash scripting

I`ve found it very useful for beginners.