Drop Down Menu Style

[Jynx]

anyone know how to change the arrow on drop down menus? I'd imagine it is done with CSS and an image but how?
here are examples of a common arrow and one which must be an image

[Thing]

<input onMouseover="this.style.color='white'" onMouseout="this.style.color='black'" type="submit" name="Votehome" value="Vote" style="height:15;width:100%;cursor:hand; font-size:12; FONT-WEIGHT: bold; background-color:transparent; border-style:none;">

This is how I change the submit button. I'm guessing you could do the same for the drop down menu.