function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//determine the direction for the blending, if start and end are the same nothing happens
	if(opacStart > opacEnd) {
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	} else if(opacStart < opacEnd) {
		for(i = opacStart; i <= opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	}
}

//change the opacity for different browsers
function changeOpac(opacity, id) 
{
    //image
	var object = document.getElementById(id).style; 
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
}

function setDescription(textid, textvalue)
{
    document.getElementById(textid).innerHTML = textvalue;
}
function setLink(lnkid,href)
{
    document.getElementById(lnkid).href = href;
}
function blendimage(divid, imageid, imagefile, millisec, textid, textvalue) {
	pic = new Image();
    pic.src=imagefile;
	
	//fade out
	opacity(imageid, 100, 0, millisec);	
	changeOpac(0,imageid);
	
	//make new image
	document.getElementById(imageid).src = pic.src;

    setDescription(textid, textvalue);
    
    setLink('lnkLiteshow',imagefile.replace("groot", "origineel"));

    //fade in
    opacity(imageid, 0, 100, millisec);
}