function getArticles(btn,colid,val) {
	if (btn.id==undefined) $('#articles').load('/services/getArticles.php?collectionid='+colid);
	else {
		btnid = btn.id;
		type = btnid.substring(0,8);
		if (type=='material') {
			$('#btn_materials').find('a').removeClass("active");
			$('#'+btn.id).addClass("active");
			$('#articles').load('/services/getArticles.php?collectionid='+colid+"&materialid="+val);
		} else if (type=='type_btn') {
			$('#btn_types').find('a').removeClass("active");
			$('#'+btn.id).addClass("active");
			$('#articles').load('/services/getArticles.php?collectionid='+colid+"&typeid="+val);
		}
	}
}