function show(region) {
	var to_check = region-1;
	document.searchfrmadvance.region[to_check].checked=true;
	
	var regioni = new Array();
for (i=0; i<document.searchfrmadvance.region.length; i++){
if (document.searchfrmadvance.region[i].checked==true) {
regioni[i] = document.searchfrmadvance.region[i].value; }
}
		cities2HttpReq = getNewHttpRequestObject();
		cities2HttpReq.onreadystatechange = loadCities2;
		cities2HttpReq.open("GET","my_ajax23.php?task=region&regioni="+regioni,true);
		cities2HttpReq.send();
}

function hide(region) {
	var to_check = region-1;
	document.searchfrmadvance.region[to_check].checked=false;
	
	var regioni = new Array();
for (i=0; i<document.searchfrmadvance.region.length; i++){
if (document.searchfrmadvance.region[i].checked==true) {
regioni[i] = document.searchfrmadvance.region[i].value; }
}
		cities2HttpReq = getNewHttpRequestObject();
		cities2HttpReq.onreadystatechange = loadCities2;
		cities2HttpReq.open("GET","my_ajax23.php?task=region&regioni="+regioni,true);
		cities2HttpReq.send();
}

	function	loadCities2() {
		if( cities2HttpReq.readyState == 4 ) {
			var respStr = cities2HttpReq.responseText;
			delete cities2HttpReq;
			cities2HttpReq = null;
			document.getElementById("grad_div").innerHTML = respStr;
		}
	}