Can anyone hellp with this? Thanks in advance LOOKUPTABLE

Hi there all!
Just joined this forum and I have a problem..
I am building a website using contao and the extension 'Lookuptable'
My plan is to have a table of values which can be viewed using the multiple search function.
The text fields work great! The problem is that I want to convert these to dropdown menus.... can this be done?

Here is part of the code from the template:

<?php if ($this->search_form_type == 'multiplefields'): ?>
<input type="hidden" name="search" value="<?php echo $this->search_fields; ?>">
<?php foreach ($this->search_searchfields as $field): ?>
<div class="search_field <?php echo $field['name']; ?>">
<label for="search_for_<?php echo $field['name']; ?>"><?php echo $field['label']; ?></label>
<input type="text" id="search_for_<?php echo $field['name']; ?>" name="for[<?php echo $field['name']; ?>]" class="text" value="<?php echo $this->for[$field['name']]; ?>">
</div>

Like I say it works great using the text fields provided, can anyone point me in the right direction to change them to dropdowns?

Thanks for reading....

*fingers crossed*