HTML image input type not submitting value on Blackberry browser

On the Blackberry web browser I have the following image inputs to submit a form:

<input type="image" name="display" value="List" src="layout_imgs/btn_list.png" alt="List" /&开发者_运维知识库gt;
<input type="image" name="display" value="Map" src="layout_imgs/btn_map.png" alt="Map" />

It displays the image, clicking submits the form, but it doesn't submit the value for the input. Is there something I'm missing, or does this just straight up not work in Blackberry?

input type=image name and value not being sent by ie and opera

This seems like it might be related. Multiple image types need to be handled differently.