$.extend({
    createUploadIframe: function(id, uri)
	{
			//create frame
            var frameId = 'jUploadFrame' + id;
            
            if(window.ActiveXObject) {
                var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                if(typeof uri== 'boolean'){
                    io.src = 'javascript:false';
                }
                else if(typeof uri== 'string'){
                    io.src = uri;
                }
            }
            else {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            }
            io.style.position = 'absolute';
            io.style.top = '-1000px';
            io.style.left = '-1000px';

            document.body.appendChild(io);

            return io			
    },
    createUploadForm: function(id, fileElementId, old_id_form)
	{
		//create form	
		var formId = 'jUploadForm' + id;
		var fileId = 'jUploadFile' + id;
		var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');	
		var i=0;
		//set attributes
		
		$(form).css('position', 'absolute');
		$(form).css('top', '-1200px');
		$(form).css('left', '-1200px');
		$(form).appendTo('body');	
		/*
		$.each(fileElementId,function(k,v){ 
				var oldElement = $('#' + k);
				var newElement = $(oldElement).clone();
				$(newElement).attr('id', fileId+(i++));
				//$(oldElement).before(newElement);
				$(newElement).appendTo(form);				
			}
		)
		*/
		$.each(fileElementId,function(k,v){ 
				
				if(old_id_form!=''){					
					var oldElement = $($("#"+old_id_form+' *[@name='+k+']'));
				}else{
					var oldElement = $('#' + k);
				}				
				var newElement = $(oldElement).clone();
				$(oldElement).attr('id', fileId+(i++));
				$(oldElement).before(newElement);
				$(oldElement).appendTo(form);
			}
		)
		
		/*
		$.each(fileElementId,function(k,v){  
				var oldElement = $('#' + k);				
				var c = document.getElementById(k).cloneNode(true);				
				oldElement.attr('id', fileId+(i++));
				oldElement.before(c);								
				form.append(oldElement);	
			}
		)	
		*/
		return form;
    },

    ajaxFileUpload: function(s) {
        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout		
        s = $.extend({}, $.ajaxSettings, s);			
        var id = new Date().getTime() ;      
		var form = $.createUploadForm(id, s.fileElementId, s.old_id_form);
		var io = $.createUploadIframe(id, s.secureuri);
		var frameId = 'jUploadFrame' + id;
		var formId = 'jUploadForm' + id;		
        // Watch for a new set of requests
        if ( s.global && ! $.active++ )
		{
			$.event.trigger( "ajaxStart" );
		}            
        var requestDone = false;
        // Create the request object
        var xml = {}   
        if ( s.global )
            $.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)
			{
				$.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 = $.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 )
                            $.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 )
                    $.event.trigger( "ajaxComplete", [xml, s] );

                // Handle the global AJAX counter
                if ( s.global && ! --$.active )
                    $.event.trigger( "ajaxStop" );

                // Process result
                if ( s.complete ){
                    s.complete(xml, status);					
				}

                $(io).unbind()

                setTimeout(function()
									{	try 
										{	
											$(io).remove();
											$(form).remove();	
											delete s;
											delete form;
											delete io;
										} catch(e) 
										{
											$.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 io = $('#' + frameId);
			var form = $('#' + formId);
			$(form).attr('action', s.url);
			$(form).attr('method', 'POST');
			$(form).attr('target', frameId);
            if(form.encoding)
			{
                form.encoding = 'multipart/form-data';				
            }
            else
			{				
                form.enctype = 'multipart/form-data';
            }			
            $(form).submit();

        } catch(e) 
		{			
            $.handleError(s, xml, null, e);
        }
        if(window.attachEvent){
            document.getElementById(frameId).attachEvent('onload', uploadCallback);
        }
        else{
            document.getElementById(frameId).addEventListener('load', uploadCallback, false);
        } 		
        return {abort: function () {}};	

    },

    uploadHttpData: function( r, type ) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        //dbug(data);
        // If the type is "script", eval it in global context
        if ( type == "script" )
            $.globalEval( data );
        // Get the JavaScript object, if JSON is used.
        if ( type == "json" )
            eval( "data = " + data );
        // evaluate scripts within html
        if ( type == "html" )
            $("<div>").html(data).evalScripts();
			//alert($('param', data).each(function(){alert($(this).attr('value'));}));
        return data;
    }
})