function BGHover(id) {
   document.getElementById('div_'+id).className='menu_div_hover';
}

function BGLeave(id) {
   document.getElementById('div_'+id).className='menu_div';
}

function Go(x) {
  if(x != "") {
    document.location.href=x;
  }
}


//// AJAX ////

// globale Instanz von XMLHttpRequest
var xmlHttp = false;

// XMLHttpRequest-Instanz erstellen
// für Internet Explorer
try {
	xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch(e) {
	try {
		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
	} catch(e) {
		xmlHttp = false;
	}
}
// für Mozilla, Opera und Safari
if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
	xmlHttp = new XMLHttpRequest();
}

function ping_office() {

	if (xmlHttp) {
		xmlHttp.open('GET', "http://www.mgvmedia.com/ping_office.php");
		xmlHttp.onreadystatechange = function () {
			if (xmlHttp.readyState == 4) {
				document.getElementById("ping_wait").style.display="none";
				if (xmlHttp.responseText.search(/online/)!=-1) {
					document.getElementById("ping_online").style.display="block";
				} else {
					document.getElementById("ping_offline").style.display="block";
				}
			}
		}
		xmlHttp.send(null);
	}
}