function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_showHideLayers() { //v6.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}


function mostra_scuola() {
	MM_showHideLayers('sotto_scuola','','show');
}

function nascondi_scuola() {
	MM_showHideLayers('sotto_scuola','','hide');
}

function mostra_corsi() {
	MM_showHideLayers('sotto_corsi','','show');
}

function nascondi_corsi() {
	MM_showHideLayers('sotto_corsi','','hide');     
}

function mostra_ecdl() {
	MM_showHideLayers('sotto_ecdl','','show');
}

function nascondi_ecdl() {
	MM_showHideLayers('sotto_ecdl','','hide');
       
}

function mostra_aziende() {
	MM_showHideLayers('sotto_aziende','','show');
    
}

function nascondi_aziende() {
	MM_showHideLayers('sotto_aziende','','hide');
    	
}

function mostra_fad() {
	MM_showHideLayers('sotto_fad','','show');
    	
}

function nascondi_fad() {
	MM_showHideLayers('sotto_fad','','hide');
    	
}

function mostra_info() {
	MM_showHideLayers('sotto_info','','show');
    
}

function nascondi_info() {
	MM_showHideLayers('sotto_info','','hide');
    	
}