function createXMLHTTP()
            {
                        try
                        {
                                   ajax = new ActiveXObject("Microsoft.XMLHTTP");
                        }
                        catch(e)
                        {
                                   try
                                   {
                                               ajax = new ActiveXObject("Msxml2.XMLHTTP");
                                               alert(ajax);
                                   }
                                   catch(ex)
                                   {
                                               try
                                               {
                                                           ajax = new XMLHttpRequest();
                                               }
                                               catch(exc)
                                               {
                                                            alert("Esse browser não tem recursos para uso do Ajax");
                                                            ajax = null;
                                               }
                                   }
                                   return ajax;
                        }
           
           
               var arrSignatures = ["MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0",
               "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP",
               "Microsoft.XMLHTTP"];
               for (var i=0; i < arrSignatures.length; i++) {
                                                                          try {
                                                                                                             var oRequest = new ActiveXObject(arrSignatures[i]);
                                                                                                             return oRequest;
                                                                          } catch (oError) {
                                                                          }
                                      }
           
                                      throw new Error("MSXML is not installed on your system.");
                        }

function Verifica_Serial(sSerial){                      
 var oHTTPRequest = createXMLHTTP();
 oHTTPRequest.open("post", "Verifica_Serial.php", true);
 oHTTPRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
 oHTTPRequest.onreadystatechange=function() {
  if (oHTTPRequest.readyState==4){
   document.getElementById('divNotice').innerHTML = oHTTPRequest.responseText; 
  }else{
	document.getElementById('divNotice').innerHTML = "<font color=\"#c0c0c0\">Carregando...</font>";
  }
 }
 oHTTPRequest.send("c=" + sSerial);
}



// Função para formatar URL
function url_encode(str) { 
    var hex_chars = "0123456789ABCDEF"; 
    var noEncode = /^([a-zA-Z0-9\_\-\.])$/; 
    var n, strCode, hex1, hex2, strEncode = ""; 
 
    for(n = 0; n < str.length; n++) { 
        if (noEncode.test(str.charAt(n))) { 
            strEncode += str.charAt(n); 
        } else { 
            strCode = str.charCodeAt(n); 
            hex1 = hex_chars.charAt(Math.floor(strCode / 16)); 
            hex2 = hex_chars.charAt(strCode % 16); 
            strEncode += "%" + (hex1 + hex2); 
        } 
    } 
    return strEncode; 
}