// 100% schermhoogte (minusThis)
function fitToScreen(elementId, minusThis) {
	// hoogte binnenkant venster
	if (typeof( window.innerWidth ) == 'number') {
		winHeight = window.innerHeight;
	} else {
		winHeight = document.body.clientHeight;
	}
	// hoogte element instellen
	frameHeight = (winHeight-minusThis)+"px";
	if (document.getElementById) {
		document.getElementById(elementId).style.height = frameHeight;
	} else {
		document.all[elementId].style.height = frameHeight;
	}
}

// Original script by Peter-Paul Koch (www.quirksmode.org)
// (deze versie werkt niet in NS4)
function writeIt(text,id) {
	// Level 1 DOM (NS6, IE5)
	if (document.getElementById) {
		x = document.getElementById(id);
		x.innerHTML = '';
		x.innerHTML = text;
	}
	// IE4 DOM
	else if (document.all) {
		x = document.all[id];
		x.innerHTML = text;
	}
}

// LET OP: iframes display none, menu writeIt (iframes writeIt crasht IE mac)
function nextLevel (currLev, frameSrc, frameWidth, title) {
	maxLev = 5;
	nextLev = currLev + 1;
	// eventuele verdere levels leeg maken
	for (i=nextLev+1; i<=maxLev; i++) {
		writeIt('', 'nav'+i);
		if (document.getElementById) {
			document.getElementById('f'+i).style.display = 'none';
			document.getElementById('nav'+i).style.width = '0px';
		} else {
			document.all['f'+i].style.display = 'none';
			document.all['nav'+i].style.width = '0px';
		}
	}
	// frame
	if (document.getElementById) {
		document.getElementById('f'+nextLev).style.display = 'inline';
		document.getElementById('f'+nextLev).style.width = frameWidth+'px';
		document.getElementById('nav'+nextLev).style.width = frameWidth+'px';
	} else {
		document.all['f'+nextLev].style.display = 'inline';
		document.all['f'+nextLev].style.width = frameWidth+'px';
		document.all['nav'+nextLev].style.width = frameWidth+'px';
	}
	writeIt(navCode (title, currLev), 'nav'+nextLev);
	//frames['f'+nextLev].location.href = frameSrc;
	setTimeout("frames['f"+nextLev+"'].location.href = '"+frameSrc+"';", 500);
	// naar rechts scrollen
	scroll(document.body['scrollWidth'],0);
}

function prevLevel (currLev) {
	maxLev = 5;
	// eigen en verdere levels leeg maken
	for (i=currLev; i<=maxLev; i++) {
		writeIt('', 'nav'+i);
		if (document.getElementById) {
			document.getElementById('f'+i).style.display='none';
			document.getElementById('nav'+i).style.width = '0px';
		} else {
			document.all['f'+i].style.display='none';
			document.all['nav'+i].style.width = '0px';
		}
	}
}

function navCode (title, currLev) {
	theCode = '<div class="navCell"><div class="terug" onClick="javascript:prevLevel('+(currLev+1)+');"><img src="pics/pijl_terug.gif" width="16" height="20" class="picto" />Terug</div><div class="titel"><img src="pics/pijl_neer.gif" width="16" height="20" class="picto" />'+title+'</div></div>';
	return theCode;
}