// Create function to load image
function loadImg(src){
    var body = document.getElementsByTagName("body")[0];
    var div = document.getElementById("gallery_container");

    if( !div ) {
        div = document.createElement('div');
        div.setAttribute('id', 'gallery_container');    
        body.appendChild(div);  

        var anch = document.createElement('a');
        anch.setAttribute('href', '#'); 
        div.appendChild(anch);
        
        var close = new Image();
        close.src = "_img/close.png"
        close.id = "gallery_close";
        close.onclick = function(){
            div.style.visibility='hidden';
            return false;
        }
        anch.appendChild(close);
        
        anch = document.createElement('a');
        anch.setAttribute('href', '#'); 
        var prev = new Image();
        anch.appendChild(prev);
        div.appendChild(anch);
        prev.src = "_img/prev.png";
        prev.id = "gallery_prev";
        
        var img = new Image()
        div.appendChild(img);
        img.src = src;
        
        anch = document.createElement('a');
        anch.setAttribute('href', '#'); 
        var next = new Image();
        anch.appendChild(next);
        div.appendChild(anch);
        next.src = "_img/next.png";
        next.id = "gallery_next";
    }else{
        var oldimg = div.getElementsByTagName("img"); 
        if( oldimg ){
            for( var i=0; i<oldimg.length; i++){
                if( oldimg[i].parentNode == div ){
                    oldimg[i].src = src;
                }
            }
        }
        div.style.visibility='visible';
    }

}