function confere_disp_capa(url){
	ajaxObj = createXMLHttp();
	ajaxObj.open("GET", url, true);
	ajaxObj.onreadystatechange =  function(){
		if(ajaxObj.readyState == 4 && ajaxObj.status==200){
			var xml = ajaxObj.responseXML;
			var num = xml.getElementsByTagName('value')[0].firstChild.nodeValue;
			var lnk = document.getElementById("status");
			var parag = lnk.parentNode;
			if(num > 0){
				lnk.innerHTML = "disponível";
				parag.id = "disp";
			}
			else{
				lnk.innerHTML = "indisponível";
				parag.id = "indisp";
			}
		}
	}
	ajaxObj.send(null);
}