function CreaOggetto(){
	var richiesta;
	var browser = navigator.appName;
	if(browser == "Microsoft Internet Explorer"){	
		richiesta = new ActiveXObject("Microsoft.XMLHTTP");	
	}
	else{	
		richiesta = new XMLHttpRequest();
	}
	return richiesta; 
} 
 
/**************************************************/

var http = CreaOggetto();
function selector()
{

	http.open('GET', 'php/search.php?currAnno=' + document.search.currAnno.value + '&currDipartimento=' + document.search.currDipartimento.value + '&currOrder=' + document.search.currOrder.value, true);
	  
	http.onreadystatechange = gestisciContenuto;
	http.send(null);
}

function gestisciContenuto()
{
	if(http.readyState == 4)
	{
		var response = http.responseText;
		document.getElementById('centrale').innerHTML = response;
	}
}