--- ajax.js	Fri Feb 09 09:56:03 2007
+++ ajax.modified.js	Fri Feb 09 10:31:43 2007
@@ -611,8 +611,6 @@
 		if ( s.global && ! jQuery.active++ )
 			jQuery.event.trigger( "ajaxStart" );
 
-		var requestDone = false;
-
 		// Create the request object
 		var xml = new XMLHttpRequest();
 
@@ -642,91 +640,97 @@
 		if ( s.global )
 		    jQuery.event.trigger("ajaxSend", [xml, s]);
 
-		// Wait for a response to come back
-		var onreadystatechange = function(isTimeout){
-			// The transfer is complete and the data is available, or the request timed out
-			if ( xml && (xml.readyState == 4 || isTimeout == "timeout") ) {
-				requestDone = true;
-				var status;
-				try {
-					status = jQuery.httpSuccess( xml ) && isTimeout != "timeout" ?
-						s.ifModified && jQuery.httpNotModified( xml, s.url ) ? "notmodified" : "success" : "error";
-					// Make sure that the request was successful or notmodified
-					if ( status != "error" ) {
-						// Cache Last-Modified header, if ifModified mode.
-						var modRes;
-						try {
-							modRes = xml.getResponseHeader("Last-Modified");
-						} catch(e) {} // swallow exception thrown by FF if header is not available
-	
-						if ( s.ifModified && modRes )
-							jQuery.lastModified[s.url] = modRes;
+		// Start polling the request
+		var intervalLock = false,
+		intervalCounter = 0,
+		intervalMillisec = 100,
+		intervalId = window.setInterval( function() {
+			if ( !intervalLock ) {
+				// Lock to prevent more executions while processing
+				intervalLock = true;
+				
+				// Check if the request has timed out
+				intervalCounter += 1;
+				var isTimeout = false;
+				if (s.timeout > 0) {
+					if (s.timeout <= intervalCounter * intervalMillisec) {
+						isTimeout = true;
+						
+						// Cancel the request
+						if ( xml ) {
+							xml.abort();
+						}
+					}
+				}
+
+				// The transfer is complete and the data is available, or the request timed out
+				if ( xml && (xml.readyState == 4 || isTimeout) ) {
+					// Clear interval
+					window.clearInterval( intervalId );
+					
+					var status;
+					try {					
+						status = jQuery.httpSuccess( xml ) && !isTimeout ?
+							s.ifModified && jQuery.httpNotModified( xml, s.url ) ? "notmodified" : "success" : "error";
+						// Make sure that the request was successful or notmodified
+						if ( status != "error" ) {
+							// Cache Last-Modified header, if ifModified mode.
+							var modRes;
+							try {
+								modRes = xml.getResponseHeader("Last-Modified");
+							} catch(e) {} // swallow exception thrown by FF if header is not available
+		
+							if ( s.ifModified && modRes )
+								jQuery.lastModified[s.url] = modRes;
+		
+							// process the data (runs the xml through httpData regardless of callback)
+							var data = jQuery.httpData( xml, s.dataType );
+		
+							// If a local callback was specified, fire it and pass it the data
+							if ( s.success )
+								s.success( data, status );
+		
+							// Fire the global callback
+							if( s.global )
+								jQuery.event.trigger( "ajaxSuccess", [xml, s] );
+						} else
+							jQuery.handleError(s, xml, status);
+					} catch(e) {
+						status = "error";
+						jQuery.handleError(s, xml, status, e);
+					}
 	
-						// process the data (runs the xml through httpData regardless of callback)
-						var data = jQuery.httpData( xml, s.dataType );
+					// The request was completed
+					if( s.global )
+						jQuery.event.trigger( "ajaxComplete", [xml, s] );
 	
-						// If a local callback was specified, fire it and pass it the data
-						if ( s.success )
-							s.success( data, status );
+					// Handle the global AJAX counter
+					if ( s.global && ! --jQuery.active )
+						jQuery.event.trigger( "ajaxStop" );
 	
-						// Fire the global callback
-						if( s.global )
-							jQuery.event.trigger( "ajaxSuccess", [xml, s] );
-					} else
-						jQuery.handleError(s, xml, status);
-				} catch(e) {
-					status = "error";
-					jQuery.handleError(s, xml, status, e);
+					// Process result
+					if ( s.complete )
+						s.complete(xml, status);								
 				}
+				
+				// Clear the interval if the request is nullified
+				if ( !xml )
+					windows.clearInterval( intervalId );
 
-				// The request was completed
-				if( s.global )
-					jQuery.event.trigger( "ajaxComplete", [xml, s] );
-
-				// Handle the global AJAX counter
-				if ( s.global && ! --jQuery.active )
-					jQuery.event.trigger( "ajaxStop" );
-
-				// Process result
-				if ( s.complete )
-					s.complete(xml, status);
-
-				// Stop memory leaks
-				xml.onreadystatechange = function(){};
-				xml = null;
+				// Remove lock
+				intervalLock = false;
 			}
-		};
-		xml.onreadystatechange = onreadystatechange;
-
-		// Timeout checker
-		if ( s.timeout > 0 )
-			setTimeout(function(){
-				// Check to see if the request is still happening
-				if ( xml ) {
-					// Cancel the request
-					xml.abort();
-
-					if( !requestDone )
-						onreadystatechange( "timeout" );
-				}
-			}, s.timeout);
-			
-		// save non-leaking reference 
-		var xml2 = xml;
+		}, intervalMillisec);
 
 		// Send the data
 		try {
-			xml2.send(s.data);
+			xml.send(s.data);
 		} catch(e) {
 			jQuery.handleError(s, xml, null, e);
 		}
-		
-		// firefox 1.5 doesn't fire statechange for sync requests
-		if ( !s.async )
-			onreadystatechange();
-		
+				
 		// return XMLHttpRequest to allow aborting the request etc.
-		return xml2;
+		return xml;
 	},
 
 	handleError: function( s, xml, status, e ) {