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			// try replacing _= if it is there
			var ret = s.url.replace(/(\?|&)_=.*?(&|$)/, "$1_=" + ts + "$2");
			// if nothing was replaced, add timestamp to the end
			s.url = ret + ((ret == s.url) ? (s.url.match(/\?/) ? "&" : "?") + "_=" + ts : "");
		}

		// If data is available, append data to url for get requests
		if ( s.data && type == "GET" ) {
			s.url += (s.url.match(/\?/) ? "&" : "?") + s.data;

			// IE likes to send both get and post data, prevent this
			s.data = null;
		}

		// Watch for a new set of requests
		if ( s.global && ! jQuery.active++ )
			jQuery.event.trigger( "ajaxStart" );

		// Matches an absolute URL, and saves the domain
		var parts = /^(\w+:)?\/\/([^\/?#]+)/.exec( s.url );

		// If we're requesting a remote document
		// and trying to load JSON or Script with a GET
		if ( s.dataType == "script" && type == "GET" && parts
			&& ( parts[1] && parts[1] != location.protocol || parts[2] != location.host )){

			var head = document.getElementsByTagName("head")[0];
			var script = document.createElement("script");
			script.src = s.url;
			if (s.scriptCharset)
				script.charset = s.scriptCharset;

			// Handle Script loading
			if ( !jsonp ) {
				var done = false;

				// Attach handlers for all browsers
				script.onload = script.onreadystatechange = function(){
					if ( !done && (!this.readyState ||
							this.readyState == "loaded" || this.readyState == "complete") ) {
						done = true;
						success();
						complete();
						head.removeChild( script );
					}
				};
			}

			head.appendChild(script);

			// We handle everything using the script element injection
			return undefined;
		}

		var requestDone = false;

		// Create the request object
		var xhr = s.xhr();

		// Open the socket
		// Passing null username, generates a login popup on Opera (#2865)
		if( s.username )
			xhr.open(type, s.url, s.async, s.username, s.password);
		else
			xhr.open(type, s.url, s.async);

		// Need an extra try/catch for cross domain requests in Firefox 3
		try {
			// Set the correct header, if data is being sent
			if ( s.data )
				xhr.setRequestHeader("Content-Type", s.contentType);

			// Set the If-Modified-Since header, if ifModified mode.
			if ( s.ifModified )
				xhr.setRequestHeader("If-Modified-Since",
					jQuery.lastModified[s.url] || "Thu, 01 Jan 1970 00:00:00 GMT" );

			// Set header so the called script knows that it's an XMLHttpRequest
			xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");

			// Set the Accepts header for the server, depending on the dataType
			xhr.setRequestHeader("Accept", s.dataType && s.accepts[ s.dataType ] ?
				s.accepts[ s.dataType ] + ", */*" :
				s.accepts._default );
		} catch(e){}

		// Allow custom headers/mimetypes and early abort
		if ( s.beforeSend && s.beforeSend(xhr, s) === false ) {
			// Handle the global AJAX counter
			if ( s.global && ! --jQuery.active )
				jQuery.event.trigger( "ajaxStop" );
			// close opended socket
			xhr.abort();
			return false;
		}

		if ( s.global )
			jQuery.event.trigger("ajaxSend", [xhr, s]);

		// Wait for a response to come back
		var onreadystatechange = function(isTimeout){
			// The request was aborted, clear the interval and decrement jQuery.active
			if (xhr.readyState == 0) {
				if (ival) {
					// clear poll interval
					clearInterval(ival);
					ival = null;
					// Handle the global AJAX counter
					if ( s.global && ! --jQuery.active )
						jQuery.event.trigger( "ajaxStop" );
				}
			// The transfer is complete and the data is available, or the request timed out
			} else if ( !requestDone && xhr && (xhr.readyState == 4 || isTimeout == "timeout") ) {
				requestDone = true;

				// clear poll interval
				if (ival) {
					clearInterval(ival);
					ival = null;
				}