//which browser?
ns4 = (document.layers)? true:false
ns6 = (document.getElementById && !document.all)? true:false
ie4 = (document.all)? true:false

//hide all layers
function hideAll() {
	var laag
	var textlaag
	//hide all layers
	for(var id=1; id<7; id++) {
			laag = 'nav0' + id;
			if(ie4) document.all[laag].style.visibility = 'hidden';
			if(ns4) document.layers[laag].visibility = "hide"
			if(ns6)	document.getElementById(laag).style.visibility = 'hidden';					
	}
	return;
}

//change layer visibility
function show(id) {

	hideAll();
	
	if (ns4) document.layers[id].visibility = "show";
	if (ie4) document.all[id].style.visibility = "visible";
	if (ns6) document.getElementById(id).style.visibility = "visible";
	
	return;
}

if (document.images) {
img1on = new Image(); // Active images
img1on.src = "img/bedrijfstrainingen.gif";
img2on = new Image(); 
img2on.src = "img/contact.gif";
img3on = new Image(); 
img3on.src = "img/download.gif";
img4on = new Image(); 
img4on.src = "img/mensendieck.gif";
img5on = new Image(); 
img5on.src = "img/nieuws.gif";
img6on = new Image(); 
img6on.src = "img/rsi.gif";
img7on = new Image(); 
img7on.src = "img/rugadvies.gif";
img8on = new Image(); 
img8on.src = "img/stress.gif";
img9on = new Image(); 
img9on.src = "img/links.gif";

img1off = new Image(); // Inactive images
img1off.src = "img/bedrijfstrainingen-r.gif";
img2off = new Image(); 
img2off.src = "img/contact-r.gif";
img3off = new Image(); 
img3off.src = "img/download-r.gif";
img4off = new Image(); 
img4off.src = "img/mensendieck-r.gif";
img5off = new Image(); 
img5off.src = "img/nieuws-r.gif";
img6off = new Image(); 
img6off.src = "img/rsi-r.gif";
img7off = new Image(); 
img7off.src = "img/rugadvies-r.gif";
img8off = new Image(); 
img8off.src = "img/stress-r.gif";
img9off = new Image(); 
img9off.src = "img/links-r.gif";
}

function imgOn(imgName) {

if (document.images) {
document[imgName].src = eval(imgName + "on.src");
}
}

function imgOff(imgName) {
if (document.images) {
document[imgName].src = eval(imgName + "off.src");
}
}


function beweeg(laag){

pos1 -= 100
if(document.getElementById){
breedte = document.getElementById(laag).offsetWidth
	if(pos1>-breedte){
		document.getElementById(laag).style.left=pos1
	}
	if(pos1>0){
		document.getElementById(laag).style.left=pos1
	}
	if(pos1>breedte){
		pos1 = 0
		document.getElementById(laag).style.left=pos1
	}
	if(pos1<-breedte){
		pos1 = 0
		document.getElementById(laag).style.left=pos1
	}
}
else{
	breedte = document.layers[laag].document.width
	if(pos1>-breedte){
		document.layers[laag].left=pos1
	}
	else{
		pos1 = 0
		document.layers[laag].left=pos1
	}
}
}


function restore() { 
alert();
  self.nav.location.reload() 
  self.content.location.href = ContentURL 
} 


function close_refresh()
{
    opener.location.reload( false );
	window.close();
}