/**
 *
 * Nick Hooijenga
 * Afbeelding aanpassen changeImage() 
 *
 * Gebruik syntax
 *
 * <a href="javascript:changeImage('image1.jpg')">Image 1</a>
 * <img name="mainimage" src="blank.jpg">
 *
**/

function changeImage(filename) {
	document.mainimage.src = filename;
}