Add Description To Linked Drop Down Menu's

I am trying to build a linked drop down menu script with descriptions. Meaning that there are 5 drop down boxes all linked together. So when somebody choses an option in the first drop down box, the options in the second box appear. And depending on which option they choose there, more other options appear in the third box and so on.

At the end (or after every drop down menu box) there must be a description area (either by using a textarea or just some space for descriptions and a table) where text will appear depending on the chosen options.

I have the script with the linked drop down boxes, but I cannot seem to add a description box. Everytime I try, the whole script gets messed up.

This is my script:

Code:
<table>
<tr>
<td width="680">

[Code]....