input image objects not found in form.elements

Imagine you write the following javascript sentence in an html page:

self.document.forms[0].elements

That will give you all the elements inside the first form (forms[0]) in the current page, right? Well, no. For some reason, if you have an input of type image (<input type="image">) in the form, that element will not be in the forms[0].elements object.

Every other input (button, text, select, submit, ...) will be in the elements object, but do not expect to find image type inputs. I've tried that in IE and Firefox unsuccessfully.

(If you don't know what an input of type image is, well it's behaviour is the same as the submit inputs but instead of a button, the user is presented with an image.)

So, how do we solve this? Well, instead of using:

self.document.forms[0].elements

we have to use the following:

self.document.all

Of course, that way, you will get a list of all the elements in the current page instead of all the elements in a form but you will find the inputs of type image in there, for certain.