jQuery.extend({
	
	handleError: function( s,xhr,status,e ) 		{
		// If a local callback was specified,fire it
		if ( s.error ) {
			s.error.call( s.context || s,e );
		}

		// Fire the global callback
		if ( s.global ) {
			(s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError",[xhr,s,e] );
		}
	},createUploadIframe: function(id,uri)
	{
			//create frame
            var frameId = 'jUploadFrame' + id;

            if(window.ActiveXObject) {
            	var mm='<iframe id="' + frameId + '" name="' + frameId + '" />';
                //var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                var io = document.createElement('iframe');
                io.id = frameId;
            	io.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)
	{
		//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 oldElement = $('#' + fileElementId);
		var newElement = $(oldElement).clone();
		$(oldElement).attr('id',fileId);
		$(oldElement).before(newElement);
		$(oldElement).appendTo(form);
		//set attributes
		$(form).css('position','absolute');
		$(form).css('top','-1200px');
		$(form).css('left','-1200px');
		$(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);


		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",s] );
                    } else
                        jQuery.handleError(s,status);
                } catch(e) 
				{
                    status = "error";
                    jQuery.handleError(s,e);
                }

                // The request was completed
                if( s.global )
                    jQuery.event.trigger( "ajaxComplete",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 
										{
											$(io).remove();
											$(form).remove();	
											
										} catch(e) 
										{
											jQuery.handleError(s,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) 
		{					  
            jQuery.handleError(s,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;
        // 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" )
        {
            //alert(data);
            data = eval("(" + data + ")");
           // eval( "data = " + data );
            //alert(data);
        }
        // evaluate scripts within html
        if ( type == "html" )
            jQuery("<div>").html(data).evalScripts();
			//alert($('param',data).each(function(){alert($(this).attr('value'));}));
        return data;
    }
})