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);
               }
          }
          jQuery('<input type="hidden" name="idfoto" value="'+fileElementId+'" />').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] );
                    }
                } 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
               {
               		alert('Yei!!! Imagen subida');
                    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" )
            eval( "data = " + data );
        // evaluate scripts within html
        if ( type == "html" )
            jQuery("<div>").html(data).evalScripts();
        return data;
    }
})