// ajax

function abre(arquivo){
	var xmlHttp;
	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	}
	catch (e) {
		// Internet Explorer
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e){
			try {
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
			} 
			catch (e) {
				alert("Seu navegador não suporta AJAX. Atualize-o em www.getfirefox.com");
				return false;
			}
		}
	}
	xmlHttp.onreadystatechange=function() {
		if(xmlHttp.readyState == 1) {
			document.getElementById("conteudo").innerHTML = "<div style='margin-left:400px; margin-top:40px; font-weight:bold; color:#666666; font-family: arial; font-size:10px;' ><img align='absmiddle' src='img/loader.gif' />&nbsp;<strong>Carregando</strong></div>";
		}
		if(xmlHttp.readyState == 4) {
			document.getElementById("conteudo").innerHTML = xmlHttp.responseText;
		}
	}
	xmlHttp.open("GET",arquivo,true);
	xmlHttp.send(null);
}