function maximizeWindow() {
	//doesn't work when other tabpages in ie7 exist
	var offset = (navigator.userAgent.indexOf("Mac") != -1 || navigator.userAgent.indexOf("Gecko") != -1 || navigator.appName.indexOf("Netscape") != -1) ? 0 : 4;
	window.moveTo(-offset, -offset);
	window.resizeTo(screen.availWidth + (2 * offset),screen.availHeight + (2 * offset));
}

function doebutton(item) {
ontfocusalles();
if(item=="demannen_1") {item="demannen";}
if(item=="demannen_2") {item="demannen";}
if(item=="demannen_3") {item="demannen";}
if(item=="demannen_4") {item="demannen";}
parent.document.images['button_'+item].src = "images/buttonf_"+item+".gif";
}

function ontfocusalles() {
parent.document.images['button_zokanhet'].src = "images/button_zokanhet.gif";
parent.document.images['button_maarookzo'].src = "images/button_maarookzo.gif";
parent.document.images['button_demannen'].src = "images/button_demannen.gif";
parent.document.images['button_contact'].src = "images/button_contact.gif";
parent.document.images['button_home'].src = "images/button_home.gif";
}

function doeplaatje(item) {
parent.document.images['plaatje'].src="images/" + item;
if(item=="demannen.jpg") {
	parent.document.images['plaatje'].useMap = "#plaatjemap";
} else {
	parent.document.images['plaatje'].useMap = "";
}
}