text: 
  jQuery.extend({
  	
  
      createUploadIframe: function(id, uri)
  	{
  			//create frame
              var frameId = 'jUploadFrame' + id;
              var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
  			if(window.ActiveXObject)
  			{
                  if(typeof uri== 'boolean'){
  					iframeHtml += ' src="' + 'javascript:false' + '"';
  
                  }
                  else if(typeof uri== 'string'){
  					iframeHtml += ' src="' + uri + '"';
  
                  }	
  			}
  			iframeHtml += ' />';
  			jQuery(iframeHtml).appendTo(document.body);
  
              return jQuery('#' + frameId).get(0);			
      },
      createUploadForm: function(id, fileElementId, data)
  	{
  		//create form	
  		var formId = 'jUploadForm' + id;
  		var fileId = 'jUploadFile' + id;
  		var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');	
  		if(data)
  		{
  			for(var i in data)
  			{
  				jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
  			}			
  		}		
  		var oldElement = jQuery('#' + fileElementId);
  		var newElement = jQuery(oldElement).clone();
  		jQuery(oldElement).attr('id', fileId);
  		jQuery(oldElement).before(newElement);
  		jQuery(oldElement).appendTo(form);
  
  
  		
  		//set attributes
  		jQuery(form).css('position', 'absolute');
  		jQuery(form).css('top', '-1200px');
  		jQuery(form).css('left', '-1200px');
  		jQuery(form).appendTo('body');		
  		return form;
      },
  
      ajaxFileUpload: function(s) {
          // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout		
          s = jQuery.extend({}, jQuery.ajaxSettings, s);
          var id = new Date().getTime();
  		var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data));
  		var io = jQuery.createUploadIframe(id, s.secureuri);
  		var frameId = 'jUploadFrame' + id;
  		var formId = 'jUploadForm' + id;		
          // Watch for a new set of requests
          if ( s.global && ! jQuery.active++ )
  		{
  			jQuery.event.trigger( "ajaxStart" );
  		}            
          var requestDone = false;
          // Create the request object
          var xml = {}   
          if ( s.global )
              jQuery.event.trigger("ajaxSend", [xml, s]);
          // Wait for a response to come back
          var uploadCallback = function(isTimeout)
  		{			
  			var io = document.getElementById(frameId);
              try 
  			{				
  				if(io.contentWindow)
  				{
  					 xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
                  	 xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
  					 
  				}else if(io.contentDocument)
  				{
  					 xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
                  	xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
  				}						
              }catch(e)
  			{
  				jQuery.handleError(s, xml, null, e);
  			}
              if ( xml || isTimeout == "timeout") 
  			{				
                  requestDone = true;
                  var status;
                  try {
                      status = isTimeout != "timeout" ? "success" : "error";
                      // Make sure that the request was successful or notmodified
                      if ( status != "error" )
  					{
                          // process the data (runs the xml through httpData regardless of callback)
                          var data = jQuery.uploadHttpData( 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);
                  }
  
                  // 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);
  
                  jQuery(io).unbind()
  
                  setTimeout(function()
  									{	try 
  										{
  											jQuery(io).remove();
  											jQuery(form).remove();	
  											
  										} catch(e) 
  										{
  											jQuery.handleError(s, xml, null, e);
  										}									
  
  									}, 100)
  
                  xml = null
  
              }
          }
          // Timeout checker
          if ( s.timeout > 0 ) 
  		{
              setTimeout(function(){
                  // Check to see if the request is still happening
                  if( !requestDone ) uploadCallback( "timeout" );
              }, s.timeout);
          }
          try 
  		{
  
  			var form = jQuery('#' + formId);
  			jQuery(form).attr('action', s.url);
  			jQuery(form).attr('method', 'POST');
  			jQuery(form).attr('target', frameId);
              if(form.encoding)
  			{
  				jQuery(form).attr('encoding', 'multipart/form-data');      			
              }
              else
  			{	
  				jQuery(form).attr('enctype', 'multipart/form-data');			
              }			
              jQuery(form).submit();
  
          } catch(e) 
  		{			
              jQuery.handleError(s, xml, null, e);
          }
  		
  		jQuery('#' + frameId).load(uploadCallback	);
          return {abort: function () {}};	
  
      },
  
      uploadHttpData: function( r, type ) {
      	var data = !type;
          data = type == "xml" || data ? r.responseXML : r.responseText;
          // If the type is "script", eval it in global context
          if ( type == "script" )
              jQuery.globalEval( data );
          // Get the JavaScript object, if JSON is used.
          if ( type == "json" ){
          	
          	data = data.replace('<pre style="word-wrap: break-word; white-space: pre-wrap;">',"").replace("</pre>","");//谷歌下
          	data = data.replace('<pre>',"").replace("</pre>","");//火狐下
          	
              /*eval( "data = " + data );*/
          }
          // evaluate scripts within html
          if ( type == "html" )
              jQuery("<div>").html(data).evalScripts();
  
          return data;
      },
      handleError: function( s, xhr, status, e ) 		{
      	// If a local callback was specified, fire it
      	if ( s.error ) {
      		s.error.call( s.context || s, xhr, status, e );
      	}
  
      	// Fire the global callback
      	if ( s.global ) {
      		(s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );
      	}
      }
  });
  
  
  
  