function gera_ajax(){
try{ ajax=new XMLHttpRequest(); }
catch(ee){
    try{ ajax=new ActiveXObject("Msxml2.XMLHTTP"); }
	catch(e){
        try{ ajax=new ActiveXObject("Microsoft.XMLHTTP"); }
		catch(E){ ajax=false;}}} return ajax; }

function busca(doc,tabela,tipo){
		var info=document.getElementById('info');
		var cnpj=document.getElementById('cnpj').value;
		var ajax=gera_ajax();
		ajax.open("GET","validacaocnpj.php?cnpj="+cnpj+"&info="+info,true);
		ajax.onreadystatechange=function(){
			if(ajax.readystate==4 && ajax.status==200){ info.innerHTML=decodeURI(ajax.responseText); }
			else{ info.innerHTML="<font color='#FF0000'><b>Verificando Documento...</b></font>";	}}
		ajax.send(null); }