function apri_sub(myvar){
	
	switch(myvar) {
	case 'servizi':
  		document.getElementById("menu_serv").style.display = "block";
		if (document.getElementById("p_4")) {
		document.getElementById("p_4").style.backgroundPosition = "0 -54px";}
  	break; 
	
	case 'cons':
  		document.getElementById("menu_cons").style.display = "block";
		if (document.getElementById("p_3")) {
		document.getElementById("p_3").style.backgroundPosition = "0 -54px";}
  	break; 
	
	case 'cont':
  		document.getElementById("menu_cont").style.display = "block";
		if (document.getElementById("p_5")) {
		document.getElementById("p_5").style.backgroundPosition = "0 -54px";}
  	break;
	}	

}

function chiudi_sub(myvar){
	switch(myvar) {
	case 'servizi':
  		document.getElementById("menu_serv").style.display = "none";
		if (document.getElementById("p_4")) {
		document.getElementById("p_4").style.backgroundPosition = "0 0";}
  	break; 
	
	case 'cons':
  		document.getElementById("menu_cons").style.display = "none";
		if (document.getElementById("p_3")) {
		document.getElementById("p_3").style.backgroundPosition = "0 0";}
  	break;
	
	case 'cont':
  		document.getElementById("menu_cont").style.display = "none";
		if (document.getElementById("p_5")) {
		document.getElementById("p_5").style.backgroundPosition = "0 0";}
  	break;
	}
}