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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);
            var execontent = function(){
              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) {
                handleError(s, xml, null, e);
              }
              //ff会给文本加上<pre>标签
              xml.responseText = xml.responseText.replace("<pre>","");
              xml.responseText = xml.responseText.replace("</pre>","");
              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 handleError(s, xml, status);
                } catch(e) {
                  status = "error";
                  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 (链接已屏蔽plete) 链接已屏蔽plete(xml, status);
                jQuery(io).unbind();
                setTimeout(function() {
                  try {
                    jQuery(io).remove();
                    jQuery(form).remove();
                  } catch(e) {
                    handleError(s, xml, null, e);
                  }
                },
                100);
                xml = null;
              }
            };
            var crossdomain = !jQuery.browser.msie || document.domain == location.hostname;
            if(!crossdomain) {
              io.src="javascript:try{"
                +"document.domain=window.location.hostname.split('.').reverse().slice(0,2).reverse().join('.');"
                +"parent.document.getElementById('"+ frameId +"').setAttribute('uploaded','uploaded');"
                +"}catch(e){}";
              var timer = window.setInterval(function(){
                try{
                  if(io.getAttribute("uploaded") == "uploaded") {
                    crossdomain = true;
                    window.clearInterval(timer);
                    execontent();
                  }
                }catch(e){}
              },1000);
            } else {
              execontent();
            }
          }
        // 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" )
            eval( "data = " + data );
        // evaluate scripts within html
        if ( type == "html" )
            jQuery("<div>").html(data).evalScripts();

        return data;
    }
})