jQuery.extend({
    createUploadIframe: function(id, uri){
        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){
		var formId = 'jUploadForm' + id;
		var fileId = 'jUploadFile' + id;
		var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
		var oldElement = jQuery('#' + fileElementId);
		var newElement = jQuery(oldElement).clone();
		jQuery(oldElement).attr('id', fileId);
		jQuery(oldElement).before(newElement);
		jQuery(oldElement).appendTo(form);
		jQuery(form).css('position', 'absolute');
		jQuery(form).css('top', '-1200px');
		jQuery(form).css('left', '-1200px');
		jQuery(form).appendTo('body');
		return form;
    },
    ajaxFileUpload: function(s){
        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;
        if ( s.global && ! jQuery.active++ )
			jQuery.event.trigger( "ajaxStart" );
        var requestDone = false;
        var xml = {}
        if ( s.global )
            jQuery.event.trigger("ajaxSend", [xml, s]);
        var uploadCallback = function(isTimeout){
			var io = document.getElementById(frameId);
			//return;
            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";
                    if ( status != "error" )
					{
                        var data = jQuery.uploadHttpData( xml, s.dataType );
                        if ( s.success )
                            s.success( data, status );
                        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);
                }
                if( s.global )
                    jQuery.event.trigger( "ajaxComplete", [xml, s] );
                if ( s.global && ! --jQuery.active )
                    jQuery.event.trigger( "ajaxStop" );
                if ( s.complete )
                    s.complete(xml, status);
                jQuery(io).unbind()
                setTimeout(function(){
					try{
						jQuery(io).remove();
						jQuery(form).remove();
						jQuery('#' + s.fileElementId).val('');
					}catch(e){
						jQuery.handleError(s, xml, null, e);
					}
				}, 100)
                xml = null
            }
        }
        if ( s.timeout > 0 ){
            setTimeout(function(){
                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)
                form.encoding = 'multipart/form-data';
            else
                form.enctype = 'multipart/form-data';
            jQuery(form).submit();
        }catch(e){
            jQuery.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;
        if ( type == "script" )
            jQuery.globalEval( data );
        if ( type == "json" )
            eval( "data = " + data );
        if ( type == "html" )
            jQuery("<div>").html(data).evalScripts();
        return data;
    }
})