<input type = image ... >

I'd like to use a tag such as <input type=image name=n value=v> to pass v as a value of $n, but it doesn't seem to work. I have this tag inside a form, and clicking on the image does trigger the program pointed to by the form, but $n is not bound to anything. (Other <input ... > tags have their values posted properly.) If I change type=image to type=submit, a button is generated and $n is bound to v as expected. Is there some way to substitute an image for a button and associate data with the image? I want to have a group of images, each with a different data value, and then have the program be told which image was clicked. Thanks. -- Russ Abbott