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++;
        }
    }
	document.getElementById('frontlayer').style.backgroundColor="#fff";
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
	opac=opacity;
	opids=id.split("/");
	for(i=0; i<opids.length; i++){
		var object = document.getElementById(opids[i]).style;
		object.opacity = (opac / 100);
		object.MozOpacity = (opac / 100);
		object.KhtmlOpacity = (opac / 100);
		object.filter = "alpha(opacity=" + opac + ")";
	}
	if(!opac){
			//prp=document.getElementById('currentpic').src;
			//prev_pic=prp;
		document.getElementById('frontcurrentpic').src=picsrc;
		if(foto["height"] > foto["width"]){
			document.getElementById('frontdia').src='dialandscape.gif';	
		}
		else{
			document.getElementById('frontdia').src='diaportret.gif';	
		}
		for(i=0; i<opids.length; i++){
			var object = document.getElementById(opids[i]).style;
			object.opacity = '';
			object.MozOpacity = '';
			object.KhtmlOpacity = '';
			object.filter = "alpha(opacity=" + '' + ")";
		}
		fotodata=new Array("titel","naam","slagzin","beschrijving");
		for(i=0; i<fotodata.length; i++){
			document.getElementById("sp_" + fotodata[i]).innerHTML="" + foto[fotodata[i]];	
			//alert(fotodata[i] + "=" + foto[fotodata[i]]);
		}
		if(foto["leeftijd"]-0>20){
			document.getElementById("str_slagzin").innerHTML="Mijn energie-avontuur is...<br /><br />";
		}
		else{
			document.getElementById("str_slagzin").innerHTML="Mijn energie-avontuur is...<br /><br />";
		}
		
		if(foto["bgheight"] > foto["bgwidth"]){
			document.getElementById('picture').style.backgroundImage='url(dialandscape.gif)';
		}
		else{
			document.getElementById('picture').style.backgroundImage='url(diaportret.gif)';	
		}
		document.getElementById('frontlayer').style.backgroundColor="#000";
		busy=false;
	}
	
}