set size of image in form button

I changed the standard form button to an image. How do I size my image that it wont strech.

<input class="imageButton" onFocus="blur()" type="image" src="but.gif" onClick="playmovie1()" >

there are probably other ways to do it, but I would import the image into paint or some other image editor and adjust the size there. try that until the image doesnt stretch.

- The Maven

There is no "import" option in "paint" Maven. What are you suggesting?

I want my image to be in size 50,50. I dont want that the form button will control the size of the image. there is any way to control the size of the form button??

I am aware that File > Import is not included on the menu. By importing I mean copy/pasting the image into paint.