function showLarge(img,obj,prc,sw,sh){
    var thumb = findPos(obj);
    var prev = getObj('prewi');
    
    prev.className = prc;
    prev.innerHTML = "<img src=\"/"+img+"\">";
    
    prev.style.left=thumb.left;
    prev.style.top=thumb.top;
    prev.style.width=sw;
    prev.style.height=sh;
    prev.style.display='block';
}

function closeLarge(){
    var prev = getObj('prewi');
    prev.style.display='none';
}