function preloadImages(images) {
	var d = window.document;
	if(d.images) {
		if(!d.preload) {
			d.preload = new Array();
		}
		var j = d.preload.length;
		for(var i = 0; i < images.length; i++) {
			d.preload[j] = new Image;
			d.preload[j++].src = images[i];
		}
	}
}
function swapImage(id, newSrc) {
	var d = window.document;
	var img;
	if((img = d.getElementById(id)) != null) {
		d.restore = img;		
		if(!img.oldSrc) {
			img.oldSrc = img.src;
		}
		img.src = newSrc;
	}
}

function swapImageRestore() {
	var restore = window.document.restore;
	if(restore) {
		if(restore.oldSrc) {
			restore.src = restore.oldSrc;
		}
	}
}
function getArrIndex(needle, haystack) {
	var found = false;
	var i = 0;
	while(!found && i < haystack.length) {
		needle == haystack[i] ? found = true : i++;
	}
	return found ? i : -1;
}

function getXMLHttpRequest() {
	var req;
	
	try {
		req = new XMLHttpRequest();
	}
	catch(e) {
		try {
			req = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e1) {
			try {
				req = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(e2) {
				req = null;
			}
		}
	}
	return req;
}

function ajaxGET(url, element) {
	var req = getXMLHttpRequest();
	
	if(req && (element == "tree")) {
		req.open("GET", url, true);
		req.onreadystatechange = function() {
			switch(req.readyState) {
				case 4:					
					var tmp_elem = document.createElement("div");
					tmp_elem.innerHTML = req.responseText;
					document.getElementById(element).parentNode.replaceChild(tmp_elem.getElementsByTagName("div")[0], document.getElementById(element));
				break;
			}
		};
		req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		req.send(null);
		return true;
	}
	return false;
}

Event.observe(window, 'load', function() {
	$$('div.submenubar').invoke('hide');
	$$('a.menu').each(function(element){
		element.observe('mouseover', function() {
			element.next(0).show();
			element.addClassName('selected');
		});
		element.observe('mouseout', function() {
			element.next(0).hide();
			element.removeClassName('selected');
		});
		element.next(0).observe('mouseover', function() {
			element.next(0).show();
			element.addClassName('selected');
		});
		element.next(0).observe('mouseout', function() {
			element.next(0).hide();
			element.removeClassName('selected');
		})
	});
	$$('a', 'input[type=button]').each(function(element) {
		element.observe('click', function() {
			element.blur();
		});
	});
});