function changeImagesOver(obj, basisImg , highlightedImg, altText, previewTitle, previewText ) 
	{
	    changeImages(basisImg, highlightedImg, altText);
	    //showUpcallTooltip(obj, previewTitle, previewText);
	    showDrempelsVrijToolTip(previewTitle);
	}

	function changeImagesOut(basisImg, highlightedImg, altText, previewTitle) 
	{
	    changeImages(basisImg, highlightedImg, altText);
	    hideDrempelsVrijToolTip(previewTitle);
	    return nd();
	}


function changeImages( basisImg , highlightedImg, altText) 
	{
	    var image = document.getElementById(basisImg);
	    image.src = highlightedImg;
	    image.alt = altText;
	}

function showUpcallTooltip(obj, previewTitle, previewText) {

	var text = '<SPAN class="previewSoortenWerkTitelintro">';
	text += previewTitle+'</SPAN><BR />';
	text += '<SPAN>'+previewText+'</SPAN>';		
   
    return overlib(text,CSSCLASS,FGCLASS,'previewFG', BGCLASS,'previewSoortenWerkBG');


}

// Classes to show/hide drempelsvrij DIV boxes. Code above using popups is NOT drempelsvrij
function showDrempelsVrijToolTip(previewTitle) {
    var div = document.getElementById(previewTitle);
    div.style.display = "block";
}

function hideDrempelsVrijToolTip(previewTitle) {
    var div = document.getElementById(previewTitle);
    div.style.display = "none";
}