David,
If you wanted to, you could do the following (although you have to get into "code" to do it).
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Open the file "/includes/modules/attributes.php" in your text editor of choice.
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Do a search on the following "attribImg" (which is the stylsheet attribute associated with the line of code that prints the attribute images to the screen -- if there are any). You'll find this in a number of lines within that file. If you are not concerned with altering the way attribute images display for Radio Buttons or Checkboxes, then you can skip the first number of them you come to as they won't pertain to your site anyhow (you said you use a "dropdown").
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SPECIFICALLY Go to around LINE 481 of the module. That line should look like the following:
$tmp_attributes_image .= '<div class="attribImg">' . zen_image(DIR_WS_IMAGES . $products_options->fields['attributes_image']) . (PRODUCT_IMAGES_ATTRIBUTES_NAMES == '1' ? '<br />' . $products_options->fields['products_options_values_name'] : '') . '</div>' . "\n";
Change that line to the folowing (ALWAYS BACKUP your origianl file first so you can revert back to it in the event you need to):
$tmp_attributes_image .= '<div class="attribImg">' . zen_image(DIR_WS_IMAGES . $products_options->fields['attributes_image']) . (PRODUCT_IMAGES_ATTRIBUTES_NAMES == '1' ? '<!--<br />' . $products_options->fields['products_options_values_name'] : '') . '--></div>' . "\n";
Notice ... all I did was commented out the line of code that shows the "values name" on the screen using standard HTML comment tags "<!-- -->".
Make sense? If you are going to be using radio buttons or checkboxes, then you will want to comment out the same section of code for each occurance found previously in the file as well.
Let me know if that works for you. In effect, all you are doing it "hiding" that section of HTML code so it doesn't show when rendering the page.