function trim(value) {
  value = value.replace(/^\s+/,'');
  value = value.replace(/\s+$/,'');
  return value;
}

function systemTogglePanelView(sender, el_id) {
	var el = document.getElementById(el_id);
	if(!el) return;
	if(el.style.visibility == 'hidden') {
		sender.src = sender.src.substring(0, sender.src.indexOf('minimize') == -1 ? sender.src.indexOf('restore') : sender.src.indexOf('minimize'))+'minimize.gif';
		el.style.visibility = "";
		el.style.display = "";
	} else {
		sender.src = sender.src.substring(0, sender.src.indexOf('minimize') == -1 ? sender.src.indexOf('restore') : sender.src.indexOf('minimize'))+'restore.gif';
		el.style.visibility = "hidden";
		el.style.display = "none";
	}
	systemSetCookie(el_id,el.style.visibility,'never');
}

function systemChangePanelView(sender, el_id, visible) {
	var el = document.getElementById(el_id);
	if(!el) return;
	if(visible == 1) {
		sender.src = sender.src.substring(0, sender.src.indexOf('minimize') == -1 ? sender.src.indexOf('restore') : sender.src.indexOf('minimize'))+'minimize.gif';
		el.style.visibility = "";
		el.style.display = "";
	} else {
		sender.src = sender.src.substring(0, sender.src.indexOf('minimize') == -1 ? sender.src.indexOf('restore') : sender.src.indexOf('minimize'))+'restore.gif';
		el.style.visibility = "hidden";
		el.style.display = "none";
	}
	systemSetCookie(el_id,el.style.visibility,'never');
}


var systemIsSetPanelView = new Array();

function systemSetPanelView(sender, el_id, id) {
	var el = document.getElementById(el_id);
	if(!el) return;
	if(systemIsSetPanelView[id]) return;
	systemIsSetPanelView[id] = 1;
	el_visibility = systemGetCookie(el_id);
	if(el_visibility == 'hidden') {
		sender.src = sender.src.substring(0, sender.src.length - 12)+'restore.gif';
		el.style.visibility = "hidden";
		el.style.display = "none";
	}
}

function systemInitializeBackend() {
	systemRestoreNavigation();
	setTimeout("systemKeepAlive();", 5000);
}

function systemKeepAlive() { 
	x = systemXmlHttp.request("POST", "http://www.kunstveiling.nl/keepalive.php", true, null, null, "", null, systemKeepAliveHandler);
//	setInterval("systemKeepAlive();", 300000);
	setTimeout("systemKeepAlive();", 300000);
}
function systemKeepAliveHandler(req) {
	return true;
}