var dofade=false;
var center=true;
var centertext=false; 

var NS4 = (navigator.appName.indexOf("Netscape")>=0 && !document.getElementById)? true : false;
var IE4 = (document.all && !document.getElementById)? true : false;
var IE5 = (document.getElementById && document.all)? true : false;
var NS6 = (document.getElementById && navigator.appName.indexOf("Netscape")>=0 )? true: false;
var W3C = (document.getElementById)? true : false;
var w_y, w_x, navtxt, boxheight, boxwidth;
var ishover=false;
var isloaded=false;
var ieop=0;
var op_id=0;

function getwindowdims() {
	w_y=(NS4||NS6)? window.innerHeight : (IE5||IE4)? document.body.clientHeight : 0;
	w_x=(NS4||NS6)? window.innerWidth : (IE5||IE4)? document.body.clientWidth : 0;
}

function getboxwidth() {
	if(NS4)boxwidth=(navtxt.document.width)? navtxt.document.width : navtxt.clip.width;
	if(IE5||IE4)boxwidth=(navtxt.style.pixelWidth)? navtxt.style.pixelWidth : navtxt.offsetWidth;
	if(NS6)boxwidth=(navtxt.style.width)? parseInt(navtxt.style.width) : parseInt(navtxt.offsetWidth);
}

function getboxheight() {
	if(NS4)boxheight=(navtxt.document.height)? navtxt.document.height : navtxt.clip.height;
	if(IE4||IE5)boxheight=(navtxt.style.pixelHeight)? navtxt.style.pixelHeight : navtxt.offsetHeight;
	if(NS6)boxheight=parseInt(navtxt.offsetHeight);
}

function movenavtxt(x,y) {
	if(NS4)navtxt.moveTo(x,y);
	if(W3C||IE4) {
		navtxt.style.left=x+'px';
		navtxt.style.top=y+'px';
	}
}

function getpagescrolly() {
	if(NS4||NS6)return window.pageYOffset;
	if(IE5||IE4)return document.body.scrollTop;
}

function getpagescrollx() {
	if(NS4||NS6)return window.pageXOffset;
	if(IE5||IE4)return document.body.scrollLeft;
}

function writeindiv(text){
	if(NS4) {
		navtxt.document.open();
		navtxt.document.write(text);
		navtxt.document.close();
	}
	if(W3C||IE4)navtxt.innerHTML=text;
}

function writetxt(text) {  
	if(isloaded) {
		if(text!=0) {
			ishover=true;
			if(NS4)text='<div class="navtext">'+((centertext)?'<center>':'')+text+((centertext)?'</center>':'')+'</div>';
			writeindiv(text);
			getboxheight();
			if((W3C || IE4) && dofade) {
				ieop=0;
				incropacity();
			}										
		}
		else {
			if(NS4)navtxt.visibility="hide";
			if(IE4||W3C) {
				if(dofade)clearTimeout(op_id);
				navtxt.style.visibility="hidden";
			}
			writeindiv('');
			ishover=false;								
		}
	}
}

function wt(text) {
	if(isloaded) {
		if(text!=0) {
			ishover=true;
			if(NS4)text='<div class="navtext">'+((centertext)?'<center>':'')+text+((centertext)?'</center>':'')+'</div>';
			writeindiv(text);
			getboxheight();
			if((W3C || IE4) && dofade) {
				ieop=0;
				incropacity();
			}												
		}
		else {
			if(NS4)navtxt.visibility="hide";
			if(IE4||W3C) {
				if(dofade)clearTimeout(op_id);
				navtxt.style.visibility="hidden";
			}
			writeindiv('');
			ishover=false;									
		}
	}
}


function incropacity() {
	if(ieop<=100) {
		ieop+=7;
		if(IE4 || IE5)navtxt.style.filter="alpha(opacity="+ieop+")";
		if(NS6)navtxt.style.MozOpacity=ieop/100;
		op_id=setTimeout('incropacity()', 50);
	}
}


function moveobj(evt) {
	if(isloaded && ishover) {
		margin=(IE4||IE5)? 1 : 23;
		if(NS6)if(document.height+27-window.innerHeight<0)margin=15;
		if(NS4)if(document.height-window.innerHeight<0)margin=10;
		//mx=(NS4||NS6)? evt.pageX : (IE5||IE4)? event.clientX : 0;
		//my=(NS4||NS6)? evt.pageY : (IE5||IE4)? event.clientY : 0;
		if (NS4) {
			mx=evt.pageX
			my=evt.pageY
		}
		else if (NS6) {
			mx=evt.clientX
			my=evt.clientY
		}
		else if (IE5) {
			mx=event.clientX
			my=event.clientY
		}
		else if (IE4) {
			mx=0
			my=0
		}

		if(NS4) {
			mx-=getpagescrollx();
			my-=getpagescrolly();
		}
		// xoff en yoff bepalen de positie van de flyby tov de cursor
		xoff=(center)? mx-boxwidth/2 + 15 : mx+5;
		yoff=(my+boxheight+30-getpagescrolly()+margin>=w_y) ?  -15 -boxheight : 20;
		movenavtxt( Math.min(w_x-boxwidth-margin , Math.max(2,xoff))+getpagescrollx() , my+yoff+getpagescrolly());
		if(NS4)navtxt.visibility="show";
		if(W3C||IE4)navtxt.style.visibility="visible";
	}
}

if(NS4)document.captureEvents(Event.MOUSEMOVE);
document.onmousemove=moveobj;
window.onresize=getwindowdims;

window.onload = function() {
	if (document.layers) {
		document.d1.visibility='show';
		setTimeout("window.onresize=regenerate",450);
	}
	navtxt=(NS4)? document.layers['navtxt'] : (IE4)? document.all['navtxt'] : (W3C)? document.getElementById('navtxt') : null;
	getboxwidth();
	getboxheight();
	getwindowdims();
	isloaded=true;
	if((W3C || IE4) && centertext)navtxt.style.textAlign="center";
	if(W3C)navtxt.style.padding='4px';
	if(IE4 || IE5 && dofade)navtxt.style.filter="alpha(opacity=0)";
}