function wOpen(link) {
    leftPos = (screen.width - 800)/2;
    topPos = (screen.height - 560)/2;

    var height = '575';

    if (screen.height <= 600)
    	height = '500';

    var win = window.open(link, 'edit', 'directories = no, fullscreen = no, height = '+height+', menubar = no, resizable = yes, status = no, titlebar = no, toolbar = no, width=750, screenX=0, hotkeys=no, left = ' + leftPos + ', top = ' + topPos);
    win.focus();
}

function wOpenScroll(link) {
    leftPos = (screen.width - 700)/2;
    topPos = (screen.height - 575)/2;
    leftPos = 0;
    topPos = 0;
    var win = window.open(link, 'edit', 'directories = no, fullscreen = no, height = 575, menubar = no, resizable = no, status = no, titlebar = no, toolbar = no, width=700, screenX=0, scrollbars=1, hotkeys=no, left = ' + leftPos + ', top = ' + topPos);
    win.focus();
}


function wOpenSmall(link) {
    leftPos = (screen.width - 700)/2;
    topPos = (screen.height - 575)/2;
    var win = window.open(link, '', 'fullscreen = no, height = 1, toolbar = no, status = no, addresbar = no, resizable = no, width=1, screenX=0, left = ' + leftPos + ', top = ' + topPos);
    win.focus();

}

function wPrint(link) {
    leftPos = (screen.width - 700)/2;
    topPos = (screen.height - 575)/2;
    var win = window.open(link, '', 'fullscreen = no, height = 450, toolbar = no, addresbar = no, resizable = no, width=600, screenX=0, left = ' + leftPos + ', top = ' + topPos);
		win.setTimeout('window.print()', 1000);
		win.setTimeout('self.close()', 3000);
}

function wPrint2() {
    leftPos = (screen.width - 700)/2;
    topPos = (screen.height - 575)/2;
    var win = window.open('print.asp', '', 'fullscreen = no, height = 450, toolbar = no, addresbar = no, resizable = no, width=600, screenX=0, left = ' + leftPos + ', top = ' + topPos);
}


function wOpenHelp(link) {
    leftPos = (screen.width - 800)/2;
    topPos = (screen.height - 600)/2;
    var win = window.open(link, 'help', 'fullscreen = no, height = 500, toolbar = no, addresbar = no, resizable = no, width=700, screenX=0, left = ' + leftPos + ', top = ' + topPos);
    win.focus();
}

function UpdateOnKeyDown(e,f)
{
	if (e.keyCode==13)
	{
		eval(f);
	}
}

function sizecheck(){

		if (navigator.appName=="Netscape") {
	  	if ( (self.innerWidth < 750) || (self.innerHeight < 400) ) {
		  	self.resizeTo( self.screen.width,  self.screen.height );
				self.moveTo(1,1);
	  	}
	  }
	  else if (navigator.appName.indexOf("Microsoft")!=-1) {
			if ((document.body.clientWidth < 750 ) || (document.body.clientHeight < 400)) {
				window.moveTo( 0, 0 );
		  	window.resizeTo( window.screen.availWidth, window.screen.availHeight );
			}
		}
}

function checkDate (day,month,year)
{
  //alert( day + month+ year);
	if (isEmpty(year) || year < 1920 || year > 2020)
		return "Jaar moet tussen 1920 en 2020 liggen";
  var maxday = 0;
	var monthName = "";

	switch (month) {
		case "1":
			monthName = "januari";
			break;
		case "2":
			monthName = "februari";
			break;
		case "3":
			monthName = "maart";
			break;
		case "4":
			monthName = "april";
			break;
		case "5":
			monthName = "mei";
			break;
		case "6":
			monthName = "juni";
			break;
		case "7":
			monthName = "juli";
			break;
		case "8":
			monthName = "augustus";
			break;
		case "9":
			monthName = "september";
			break;
		case "10":
			monthName = "oktober";
			break;
		case "11":
			monthName = "november";
			break;
		case "12":
			monthName = "december";
			break;
	}


	switch (month) {
		case "1":
		case "3":
		case "5":
		case "7":
		case "8":
		case "10":
		case "12":
			maxday = 31;
			break;
		case "2":
			if (LeapYear(year))
				maxday = 29
			else
				maxday = 28;
			break;
		case "4":
		case "6":
		case "9":
		case "11":
			maxday = 30;
			break;
	}

	if ((maxday < day) || (day < 1))
	{
		if (maxday < 30)
		{
		  return ("De maand " + monthName + " heeft maar " + maxday + " dagen in " + year + ".");
		}
		else
		  return ("De maand " + monthName + " heeft maar " + maxday + " dagen" + ".");
	}
	return "";
}

function LeapYear(intYear)
{
	if (intYear % 100 == 0)
	{
		if (intYear % 400 == 0) { return true; }
	}
	else
	{
		if ((intYear % 4) == 0) { return true;	}
	}
	return false;
}

function meta_tab_onload()
{
	var tab = document.getElementById('meta_tab_1');
	if (tab!=null)
	{
		var href = tab.getElementsByTagName('A');
		window.open(href[0].href,'metadata');

		set_meta_tab('0');
	}
}

function set_meta_tab(select)
{
	var p = document.getElementById('meta_tabs');
	var tabs = p.getElementsByTagName('TABLE');
	var klasses;

	for(var i=0;i<tabs.length;i++)
	{
		klasses = tabs[i].getElementsByTagName('TD');

		if (i!=select)
		{
			if (i!=0)
				klasses[0].className = 'TabLevel2NietActiefLinks'
			else
				klasses[0].className = 'TabLevel2NietActiefLinksLinks'

			klasses[1].className = 'TabLevel2NietActief'
			klasses[2].className = 'TabLevel2NietActiefRechts'
		}
		else
		{
			if (i!=0)
				klasses[0].className = 'TabLevel2ActiefLinks'
			else
				klasses[0].className = 'TabLevel2ActiefLinksLinks'

			klasses[1].className = 'TabLevel2Actief'
			klasses[2].className = 'TabLevel2ActiefRechts'
		}


	}
}

function mod_tab_onload()
{
	var tab = document.getElementById('mod_tab_1');
	if (tab!=null)
	{
		var href = tab.getElementsByTagName('A');
		window.open(href[0].href,'main');

		set_mod_tab('0');
	}
}

function set_mod_tab(select)
{
	var p = document.getElementById('mod_tabs');
	var tabs = p.getElementsByTagName('TABLE');
	var klasses;

	for(var i=0;i<tabs.length;i++)
	{
		klasses = tabs[i].getElementsByTagName('TD');

		if (i!=select)
		{
			if (i!=0)
				klasses[0].className = 'TabNietActiefLinks'
			else
				klasses[0].className = 'TabNietActiefLinksLinks'

			klasses[1].className = 'TabNietActief'
			klasses[2].className = 'TabNietActiefRechts'
		}
		else
		{
			if (i!=0)
				klasses[0].className = 'TabActiefLinks'
			else
				klasses[0].className = 'TabActiefLinksLinks'

			klasses[1].className = 'TabActief'
			klasses[2].className = 'TabActiefRechts'
		}


	}
}

function enter(event){
  if (event.keyCode !=13) {return false;}
  return true;
 }

function readspeaker(contentPanelId)
{
	// Uitlezing overgenomen uit het document 'ReadSpeakerSayIt_Technical_Product_Description_v_1 3_dec2006.doc'
	var contentPanel = document.getElementById(contentPanelId);
	
	// Zie: http://blog.coderlab.us/2006/04/18/the-textcontent-and-innertext-properties/
	//var hasInnerText = (document.all) ? true : false;
	var hasInnerText = (document.getElementsByTagName("body")[0].innerText != undefined) ? true : false;
	
	var sTextToRead = '';
	
	// Te lezen tekst staat binnen één <div>-blok.
	if (contentPanel)
	{
    	if (!hasInnerText)
    	{
    		sTextToRead = contentPanel.textContent;		// Firefox.
    	}
    	else
    	{
    		sTextToRead = contentPanel.innerText;		// IE, etc.
    	}
	}
	// Te lezen tekst staat binnen meerdere <tr>-blokjes.
	else
	{
		var arTrBlokjes = document.getElementsByName(contentPanelId);		// Firefox only.
		
		if (arTrBlokjes.length == 0)
		{
			arTrBlokjes = getElementsByName_IEFix('tr', contentPanelId);	// IE fix.
		}
		
		for (var i = 0; i < arTrBlokjes.length; i++)
		{

			if (!hasInnerText)
			{	
				sTextToRead = sTextToRead + arTrBlokjes[i].textContent + '\r\n';	// Firefox.	
			}
			else
			{
				sTextToRead = sTextToRead + arTrBlokjes[i].innerText + '\r\n';		// IE, etc.
			}

		}
	}
 	
	// Lees als er iets te lezen valt.	
	if (sTextToRead != '')
	{
		if (window.location.href)
		{
			document.rs_form.url.value = window.location.href;
		} 
		else if (document.location.href)
		{
			document.rs_form.url.value = document.location.href;
		}

		document.rs_form.rstext.value = sTextToRead;

		document.rs_form.submit();
	}
}

// getElementsByName werkt niet goed binnen IE, vandaar deze omzeil-functie.
// Zie: http://www.dreamincode.net/code/snippet293.htm
function getElementsByName_IEFix(tag, name)
{
     var elem = document.getElementsByTagName(tag);
     var arr = new Array();
     
     for (i = 0, iarr = 0; i < elem.length; i++)
     {
          att = elem[i].getAttribute("name");
          
          if (att == name)
          {
               arr[iarr] = elem[i];
               iarr++;
          }
     }
     
     return arr;
}