<input type=“image”>

Sometimes, designers wish to create their own submit button using a graphical program. The image value works exactly the same way the submit value works. The SRC attribute defines the URL of the image; the ALT attribute will be displayed if the browser is incapable of displaying images; the width and height attributes define the width and height of the image; the border attribute defines whether a border is desired.
<input type="image" src="URL-of-image" alt="text" width="xx" height="yy" border="0" />
<input type="image" src="http://www.company.com/images/ clickme.gif" alt="Click Me to Submit" width="30" height="10" border="0" />

<input type="image" src="URL-of-image" alt="text" width="xx" height="yy" border="0" />