function showLarge(img,obj,prc,sw,sh){
    var thumb = findPos(obj);
    var prev = getObj('prewi');
    
    if(prev != null){
	prev.className = prc;
	prev.innerHTML = "<img src=\""+BLOC+"/"+img+"\">";
	prev.style.left=thumb.left+'px';
	prev.style.top=thumb.top+'px';
	prev.style.width=sw+'px';
	prev.style.height=sh+'px';
	prev.style.zIndex='1000';
	prev.style.display='block';
    }
}

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