Updating option/select value.

[tomtom]

Hey there. What I'd like to do is have a list which is selected from mysql. Each is a drop-down.

 

<select name="groupid">

<option value="bla">bla

<option value="bla">bla

<option value="custom">custom

 

So when they click custom, I'd like a div to appear with the forum. So far, easy, and I can do that. With the form...Then, when they click submit. I want it to instead of submitting a form using PHP or whatever. I'd like it to use ajax...again, pretty simple.

 

Then on some script that ajax has posted the info to. It's going to implode the info submitted into a list. - Again simple.

 

The final part is where I don't know what to do. I'd like it to update option value="custom" in the select with that group id with the imploded list.

 

It's hard to explain, so if you have any queries just post. I'd appreciate all help. Thanks