function expand(thistag, tag) {
	styleObj=document.getElementById(thistag);
	if (styleObj.className=="moretext_visible")
	{
		if (tag.tag!=null){
			temp = tag.innerHTML;
			tag.innerHTML = tag.tag;
			tag.tag=temp;
		}
		else
		{
			tag.innerHTML = "lees meer >>";
		}
		styleObj.className="moretext_hidden";
	}
	else {
		if (tag.tag!=null){
			temp = tag.innerHTML;
			tag.innerHTML = tag.tag;
			tag.tag=temp;
		}
		else
		{
			tag.innerHTML = "verberg extra text <<";
		}
		styleObj.className="moretext_visible";
	}
}
function showImage(imageName, ImageSource){
	document.getElementById('image_overlay').style.height=getWindowHeight();
	document.getElementById('image_overlay').className="image_overlay_visible";
	document.getElementById('image_overlay1').className="bigImage";
	document.getElementById('image_overlay1').style.top=getScrollHeight();
	document.getElementById('imgBig').src=imageName;
	document.getElementById('imgBig').alt='Bezig met laden...';
	document.getElementById('imgBig').title=ImageSource.title;
	document.getElementById('imgText').innerHTML=ImageSource.title;
}
function hideImage(){
	document.getElementById('image_overlay').className="image_overlay_hidden";
	document.getElementById('image_overlay1').className="image_overlay_hidden";
	document.getElementById('imgBig').src='';
}
function getScrollHeight()
{
   var h = window.pageYOffset ||
           document.body.scrollTop ||
           document.documentElement.scrollTop;
           
   return h ? h : 0;
}
function getWindowHeight()
{
	var pageWidth, pageHeight;
	if( window.innerHeight && window.scrollMaxY ) { // Firefox 
	pageWidth = window.innerWidth + window.scrollMaxX;
	pageHeight = window.innerHeight + window.scrollMaxY;
	}
	else if( document.body.scrollHeight > document.body.offsetHeight ) // all but Explorer Mac
	{
	pageWidth = document.body.scrollWidth;
	pageHeight = document.body.scrollHeight;
	}
	else // works in Explorer 6 Strict, Mozilla (not FF) and Safari
	{ pageWidth = document.body.offsetWidth + document.body.offsetLeft; pageHeight = document.body.offsetHeight + document.body.offsetTop; }
	return pageHeight;
}