function setMenuActive(image)
{
	image.onload = null;
	image.src = image.src.replace(/\.(\w{3,})$/, "_on.$1");
}
function setMenuHover(image)
{
	image.onload = null;
	image.default_src = image.src;
	image.hover_src   = image.src.replace(/\.(\w{3,})$/, "_on.$1");
	image.onmouseover = set_hover_image;
	image.onmouseout  = set_default_image;
}
function set_hover_image()
{
	this.src = this.hover_src;
}

function set_default_image()
{
	this.src = this.default_src;
}

windows = {};
function pop(id, url, width, height, options)
{
	if (options != null) options = "," + options;
	
	var win = window.open(url, id, 'width='+width+',height='+height+',scrollbars=yes,resizable=yes,toolbar=no,directories=no,location=no,menubar=no,status=no' + options);
	if (win) {
		win.focus();
		windows[id] = win;
	}
	return false;
}