if (document.images) {
	css_buttonson = new Image(139, 20);
	css_buttonson.src = "img/buttons/button2_css_buttons.gif";
	css_buttonsoff = new Image(139, 20);
	css_buttonsoff.src = "img/buttons/button1_css_buttons.gif";
	diashowon = new Image(139, 20);
	diashowon.src = "img/buttons/button2_diashow.gif";
	diashowoff = new Image(139, 20);
	diashowoff.src = "img/buttons/button1_diashow.gif";
	imagemapon = new Image(139, 20);
	imagemapon.src = "img/buttons/button2_imagemap.gif";
	imagemapoff = new Image(139, 20);
	imagemapoff.src = "img/buttons/button1_imagemap.gif";
	kleurenon = new Image(139, 20);
	kleurenon.src = "img/buttons/button2_kleuren.gif";
	kleurenoff = new Image(139, 20);
	kleurenoff.src = "img/buttons/button1_kleuren.gif";
	popups1on = new Image(139, 20);
	popups1on.src = "img/buttons/button2_popups1.gif";
	popups1off = new Image(139, 20);
	popups1off.src = "img/buttons/button1_popups1.gif";
	popups2on = new Image(139, 20);
	popups2on.src = "img/buttons/button2_popups2.gif";
	popups2off = new Image(139, 20);
	popups2off.src = "img/buttons/button1_popups2.gif";
	popups3on = new Image(139, 20);
	popups3on.src = "img/buttons/button2_popups3.gif";
	popups3off = new Image(139, 20);
	popups3off.src = "img/buttons/button1_popups3.gif";
	metatagson = new Image(139, 20);
	metatagson.src = "img/buttons/button2_metatags.gif";
	metatagsoff = new Image(139, 20);
	metatagsoff.src = "img/buttons/button1_metatags.gif";
	mouseoveron = new Image(139, 20);
	mouseoveron.src = "img/buttons/button2_mouseover.gif";
	mouseoveroff = new Image(139, 20);
	mouseoveroff.src = "img/buttons/button1_mouseover.gif";
	jsklokjeon = new Image(139, 20);
	jsklokjeon.src = "img/buttons/button2_jsklokje.gif";
	jsklokjeoff = new Image(139, 20);
	jsklokjeoff.src = "img/buttons/button1_jsklokje.gif";
	textureson = new Image(139, 20);
	textureson.src = "img/buttons/button2_textures.gif";
	texturesoff = new Image(139, 20);
	texturesoff.src = "img/buttons/button1_textures.gif";
	reactieon = new Image(139, 20);
	reactieon.src = "img/buttons/button2_reactie.gif";
	reactieoff = new Image(139, 20);
	reactieoff.src = "img/buttons/button1_reactie.gif";
	homeon = new Image(139, 20);
	homeon.src = "img/buttons/button2_home.gif";
	homeoff = new Image(139, 20);
	homeoff.src = "img/buttons/button1_home.gif";
	}

	function button(imgname) {
    if (document.images) {
    document[imgname].src = eval(imgname + 'on.src');
   	}
}

	function buttoff(imgname) {
    if (document.images) {
    document[imgname].src = eval(imgname + 'off.src');
    }
}