img0_on = new Image(186,25);
img0_on.src="landingimages/tuin_over.jpg";
img0_off = new Image(186,25);
img0_off.src="landingimages/tuinvoordeel.jpg";

img1_on = new Image(103,33);
img1_on.src="landingimages/sauna_over.jpg";
img1_off = new Image(103,33);
img1_off.src="landingimages/saunavoordeel.jpg";

img2_on = new Image(186,25);
img2_on.src="landingimages/zwembad_over.jpg";
img2_off = new Image(186,25);
img2_off.src="landingimages/zwembadvoordeel.jpg";

img3_on = new Image(103,33);
img3_on.src="landingimages/whirlpool_over.jpg";
img3_off = new Image(103,33);
img3_off.src="landingimages/whirlpoolvoordeel.jpg";

function over_image(parm_name)
     {
        document[parm_name].src = eval(parm_name + "_on.src");
     }
function off_image(parm_name)
     {
        document[parm_name].src = eval(parm_name + "_off.src");
     }