function calendar_jumpdate() {
	var month = document.forms.mod_calendar.calendar_month.options[document.forms.mod_calendar.calendar_month.selectedIndex].value;
	var year = document.forms.mod_calendar.calendar_year.options[document.forms.mod_calendar.calendar_year.selectedIndex].value;
	location.href = 'index.php?a=calendar&sm='+month+'&sy='+year+'&cd='+document.forms.mod_calendar.cd.value;
}

var curSubNav = 0;
function showSubNav(nr) {
	if (curSubNav > 0) {
		document.getElementById("subnav_"+curSubNav).style.display = "none";
	}
	if (nr > 0) {
		document.getElementById("subnav_"+nr).style.display = "block";
	}
	curSubNav = nr;
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		navbar_01_over = newImage("gfx/navbar_01-over.gif");
		navbar_03_over = newImage("gfx/navbar_03-over.gif");
		navbar_05_over = newImage("gfx/navbar_05-over.gif");
		navbar_07_over = newImage("gfx/navbar_07-over.gif");
		navbar_09_over = newImage("gfx/navbar_09-over.gif");
		navbar_11_over = newImage("gfx/navbar_11-over.gif");
		navbar_13_over = newImage("gfx/navbar_13-over.gif");
		preloadFlag = true;
	}
}