Function not found

Hi all,
This is my first post here, so please forgive me if I’m missing any common post etiquette. Please feel free to point me towards any post recommendation documents that I might have missed.

I am creating a new wordpress plugin, and this is the first time I’ve done this.

The file I’m working on is just meant to allow the user to manage a list of resources (add, delete, create, and change between Active and Inactive). I had this all working with multiple files (resources.php, resources_delete.php, resources_add.php, etc) but thought it was probably not good programming to have a different file for every action. I am working now on having all of the resources code within one file (resources.php).

I have created a drop-down box so the user can choose if they want to see active resources or inactive ones. Based on the drop-down box, I want to change the output of the page. When the dropdown is updated, a function called “process()” would be called to display the page based on the input. However, when I click the View button, it says the function is not found.

Can anyone help? Is there some way that I’m supposed to register the function or am I just out to lunch on my method here?

<?php 

global $wpdb; 

$ddoutput = $pre_HTML; 

$ddoutput .= "<form action=process($dropdown) method=\"post\" name=\"actorinact\">
Record Type:
<select name=\"dropdown\" value=\"options\">
<option value>Choose an option</option>
<option value=\"active\">Active</option>
<option value=\"inactive\">Inactive</option>
</SELECT>

<INPUT type=\"submit\" value=\"View\">

</form> ";

$ddoutput .= $post_HTML; 

echo $ddoutput;

function process($dropdown)
{.....

Thanks very much,
Heather