function quickAjax( url, func, send, extra ) {var method = send == null ? 'GET' : 'POST';
var text = null;
var req = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject( 'Microsoft.XMLHTTP' );;
var ok = false;
try{req.onreadystatechange = function(){if( req.readyState == 4 && ! ok ) {if( func ) func( req.responseText, extra );
text = req.responseText;
ok = true;}}
req.onload = function(){if( ! ok ) {if( func ) func( req.responseText, extra );
text = req.responseText;
ok = true;}}
} catch( e ){}
try {req.open( method, url, func ? true : false );} catch( e ) {return 'error en req.open';}
if( method == 'POST' ) {req.setRequestHeader( 'Content-type', 'application/x-www-form-urlencoded' );
req.setRequestHeader( 'Connection', 'close' );}
req.send( send );
if( ! func ) return text;}