var oldelement = 'dummy';
    var oldelementid = '';
    
    function OpenInfoDetail(elementid){    
        element = 'Item' + elementid;
        oldelement = 'Item' + oldelementid;
        obj1  = document.getElementById(element);
        obj2  = document.getElementById(oldelement);
        style1 = obj1.style;
        style2 = obj2.style;
        if(style1.display=='none'){
            style1.display = 'block';
            if((!((elementid=='0')&&(oldelement=='dummy')))&&(oldelement!=element)){
                //style2.display = 'none';
            }
            oldelement = element;
        }else{
            if(style1.display=='block'){
                style1.display = 'none';
                if(element!=oldelement){
                    //style2.display = 'block';
                    //oldelement = element;
                }else{
                    oldelement = 'dummy';
                }
            }
        }
        oldelementid = elementid;
    }
    
    var lijstpos = 1;
    var lijstmax = 1;
    
    function ToonMeerFotos(){
        if (lijstpos < lijstmax){
            document.getElementById('fotoreeks'+lijstpos).style.display='none'; 
            document.getElementById('fotoreeks'+(lijstpos+1)).style.display='block';
            lijstpos++;
        }else{
            document.getElementById('fotoreeks'+lijstpos).style.display='none'; 
            document.getElementById('fotoreeks1').style.display='block';
            lijstpos=1;
        }
    }