It should be
<input type="image" id="myimage" src="[...]" />
So "image" instead of "submit". It will still be a button which submits on click.
If your image is bigger than the button which is shown; let's say the image is 200x200 pixels; add this to your stylesheet:
#myimage {
height: 200px;
width: 200px;
}
or directly in the button tag:
<input type="image" id="myimage" style="height:200px;width:200px;" src="[...]" />
Note however that resizing the image like this might not yield ideal results; if e.g. your image is much smaller than you want it to be shown, you will see the single pixels; if on the other hand it is much bigger, you are wasting precious bandwidth of your users. So resizing the picture itself to the actual size is preferrable over rescaling via stylesheets!
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