function expandit(curobj)

{
var ns6=document.getElementById&&!document.all?1:0

var head="display:''"
var folder=''

folder=ns6?curobj.nextSibling.nextSibling.style:document.all[curobj.sourceIndex+1].style
if (folder.display=="none")
folder.display=""
else
folder.display="none"
}

function change_image ( img , gif ) 

	{
	 img_el = img ;
	 gif_el = gif ;
	 
	 rslt = document.accedi[img_el];
	 rslt.src = gif_el ;
	}

function array_tVis( id, mode )

{
var new_array = new Array("div_corti","div_film","div_docu","div_comu");

for (var i=0; i<4; i++)
      {
        if ( new_array[i] == id ) toggleVisibility(new_array[i], 'show');
        else toggleVisibility(new_array[i], 'hidden');
      }
}

function toggleVisibility(id, mode) {
	var NNtype = (mode == "show") ? mode : "hidden";
	var IEtype = (mode == "show") ? "visible" : "hidden";
	var WC3type = (mode == "show") ? "visible" : "hidden";
	if (document.getElementById) {
		eval("document.getElementById(id).style.visibility = \"" + WC3type + "\"");
	} else {
		if (document.layers) {
			document.layers[id].visibility = NNtype;
		} else {
			if (document.all) {
				eval("document.all." + id + ".style.visibility = \"" + IEtype + "\"");
			}
		}
	}
}