function popup(url, width, height, scrollbars) {
	scrollbars = (scrollbars || scrollbars == undefined) ? 'yes' : 'no';
	var w = window.open(url, "popup", "width="+width+",height="+height+",scrollbars="+scrollbars+",resizable=no");
	w.focus();
}

function showPage(page) {
	var path = document.location.pathname;
	var querystring = document.location.search;
	var pageStartPos = querystring.indexOf('page=');
	if (pageStartPos >= 0) {
		path += querystring.substring(0, pageStartPos) + 'page=' + page;
		var pageEndPos = querystring.indexOf('&', pageStartPos);
		if (pageEndPos > 0) {
			path += querystring.substring(pageEndPos);
		}
	} else {
		path += querystring + '&page=' + page;
	}
	document.location.href = path;
}