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) {
		home_over = newImage("images/home-button-over.gif");
		activities_over = newImage("images/activities-button-over.gif");
		links_over = newImage("images/links-button-over.gif");
		contact_over = newImage("images/contact-button-over.gif");
		preloadFlag = true;
	}
}

var mapWin;
function openMapWin(url)
{		
	if (mapWin) // if window has been opened
	{
  		if (!mapWin.closed) // and hasn't been manually closed
   			mapWin.focus(); // bring to the front
	}
	mapWin = window.open(url, "mapWin", "width=650, height=520, top=15, left=15, scrollbars=1, resizable=1, toolbars=0, location=0, status=0, menubar=0");
}