support request

Functions required:

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blockquote>
drupal_hook_form_alter()
why? To check to see if fields are or are not null (note that "drupal" will be replaced with a suggested module name for anyone who thinks that this should be modulated)
dropdown()
Preferred/chosen method, due to its being concise. For larger sites, it would probably be best to use some kind of auto-complete function
foreach()
This is used to fill the drop-down with options (the variable $option will be used)
submit()
To initiate actions which will fill the form in question with the user entries made herein