function navbar(tema, pages, selected){
	var nav = "";
	var i;
	for (i=1;i<pages+1;i++)
		if (i==selected)
			nav += "<span class=\"selected\">[" + i + "]</span>&nbsp;";
		else
			nav += "<a href=\"tema" + tema + "_" + i + ".htm\">" + i + "</a>&nbsp;";
			
	if (selected > 1)
		nav = "<a class=\"prev\" href=\"tema" + tema + "_" + (selected-1) + ".htm\"><</a> " + nav;
	if (selected < pages)
		nav += "<a class=\"next\" href=\"tema" + tema + "_" + (selected+1) + ".htm\">></a>";
		
	document.write("<div class=\"navbar\">" + nav + "<div>");
}