//icons added by ND
	iconsOffsetTop = 33;
	
	function moveUp()
	{
		self.scroll(0,0);
		document.all.icon2.style.top = (iconsOffsetTop+80)+"px";
		document.all.icon1.style.top = (iconsOffsetTop+100)+"px";
		if (isMac)
		{
			setTimeout("macPositionIconsTop()",200);
		}
	}

	function tryPrint()
	{
		if (isMac) {alert("Printfunctionaliteit op de Mac wordt alleen vanuit het programmamenu ondersteund."); return;}
		if (isIE5plus || isNN6plus){
			window.print();
		} 
			
	}
	
	function setBeforePrintStyle(){
		document.getElementById("menu-column").style.display = "none";	
		document.getElementById("siteheader").style.display = "none";		
	}
	
	function setAfterPrintStyle(){
		document.getElementById("menu-column").style.display = "";	
		document.getElementById("siteheader").style.display = "";		

	}

	function writeIcons()
	{
		if (window.thisIsHome) return;
		//preload images;
		upImg = new Image(); upImgF = new Image();
		printImg = new Image(); printImgF = new Image();
		upImg.src = "images/icon_up_off.gif"; upImgF.src ="images/icon_up_over.gif";
		printImg.src = "images/icon_print_off.gif"; printImgF.src ="images/icon_print_over.gif";
		document.write('<div id="icon2" style="position: absolute; left: 751px; top: '+(iconsOffsetTop+80)+'px; width: 25px; visibility: true"><a href="" onclick="tryPrint(); this.blur(); return false;" onmouseover="document.printIcon.src=printImgF.src; status=\'Print deze pagina\'" onmouseout="document.printIcon.src=printImg.src; status=\'\'"><img src="images/icon_print_off.gif" width="21" height="21" alt="Print deze pagina" title="Print deze pagina" border="0" name="printIcon"></a><br></div>');
		document.write('<div id="icon1" style="position: absolute; left: 751px; top: '+(iconsOffsetTop+100)+'px; width: 25px; visibility: hidden"><br style="font-size: 3px"><a href="#" onclick="moveUp(); this.blur(); return false;" onmouseover="document.upIcon.src=upImgF.src; status=\'Naar boven\'" onmouseout="document.upIcon.src=upImg.src; status=\'\'"><img src="images/icon_up_off.gif" width="21" height="21" alt="Naar boven" title="Naar boven" border="0" name="upIcon"></a><br></div>');
		if (document.all) window.onscroll = positionIcons;
		else window.onmousemove = positionIcons;	
	}
	
	function macPositionIcons()
	{
		document.all.icon1.style.top = (document.body.scrollTop+iconsOffsetTop)+"px";
		document.all.icon2.style.top = (document.body.scrollTop+iconsOffsetTop-20)+"px";
	}
	
	function macPositionIconsTop()
	{
		document.all.icon2.style.top = (iconsOffsetTop+80)+"px";
		document.all.icon1.style.top = (iconsOffsetTop+100)+"px";
	}
	
	function positionIcons()
	{
		scrollOffset = 100;
		if (document.all) {
			if (document.body.scrollTop<scrollOffset) {
				document.all.icon1.style.visibility = "hidden";
				document.all.icon2.style.top = (scrollOffset+iconsOffsetTop-20)+"px";
				return;
			}
			else document.all.icon1.style.visibility = "visible";
		}
		else {
			if (window.scrollY<scrollOffset) {
				document.getElementById("icon1").style.visibility = "hidden";
				document.getElementById("icon2").style.top = (scrollOffset+iconsOffsetTop-20)+"px";
				return;
			}
			else document.getElementById("icon1").style.visibility = "visible";
		}
		
		if (isMac)
		{
			setTimeout("macPositionIcons()",200);
		}
		else if (document.all){
			document.all.icon1.style.top = (document.body.scrollTop+iconsOffsetTop)+"px"; 
			document.all.icon2.style.top = (document.body.scrollTop+iconsOffsetTop-20)+"px";
		}
		else{
			document.getElementById("icon1").style.top = (window.scrollY+iconsOffsetTop)+"px";
			document.getElementById("icon2").style.top = (window.scrollY+iconsOffsetTop-20)+"px";
		}
	}
	
	//check browservaardigheid
	var agent = window.navigator.userAgent; var i = agent.indexOf("MSIE ")+5;
	isIE5plus = ( parseInt(agent.substr(i)) >= 5 && agent.indexOf("5.0b1") < 0 );
	isNN6plus = (agent.indexOf("Netscape") > 0);
	isMac     = ((agent.indexOf("Mac")!=-1)||(agent.indexOf("mac")!=-1)); 
	
			window.onbeforeprint = setBeforePrintStyle;
			window.onafterprint = setAfterPrintStyle;