Editing RSS standard widget from Aptana

[HenkJan]

I am completely new to programming widsets and don't have too much experience with java.
I downloaded Aptana Studio and used the wizard to create a standard rss reader functionality.
Before I load the rss reader I have a standard html page.
WHen I load the actual reader I want to have a go back functionality, either in the menu (preferred) or in the soft keys.
Here is the part of the code that I changed (in underlined), the Back button does show in the Menu but how to integrate the go back functionality?

// Constants for menu item identifiers.
var MENU_ITEM_SETTINGS = 0;
var MENU_ITEM_REFRESH = 1;
var MENU_ITEM_ABOUT = 2;
var MENU_ITEM_BACK = 3;

// Feed update timer identifier.
var updateTimerId = null;

//About menu lable
var aboutLabel;

// Feed name, URL and update frequency (in milliseconds; -1 if no auto update).
var feedName = "N95 News";
var feedURL = "http://feeds.feedburner.com/N95";
var feedUpdateFrequency = -1;

// Next scheduled update time; -1 if never.
var feedUpdateTime = -1;

// Called from the onload event handler to initialize the widget.
function init() {
    if (window.widget) {
        // set tab-navigation mode and show softkeys
        widget.setNavigationEnabled(false);
        window.menu.showSoftkeys();
        
        // create menu
        var settingsMenuItem = new MenuItem("Settings", MENU_ITEM_SETTINGS);
        settingsMenuItem.onSelect = menuItemSelected;
        menu.append(settingsMenuItem);
        var refreshMenuItem = new MenuItem("Refresh", MENU_ITEM_REFRESH);
        refreshMenuItem.onSelect = menuItemSelected;
        menu.append(refreshMenuItem);
	var aboutMenuItem = new MenuItem("About", MENU_ITEM_ABOUT);
	aboutMenuItem.onSelect = menuItemSelected;
	menu.append(aboutMenuItem);
	var backMenuItem = new MenuItem("Back", MENU_ITEM_BACK);
	backMenuItem.onSelect = menuItemSelected;
	menu.append(backMenuItem);
    }
    


// Callback for when menu items are selected.
function menuItemSelected(id) {
    switch (id) {
        case MENU_ITEM_SETTINGS:
            showSettings();
            break;
        case MENU_ITEM_REFRESH:
            updateFeed();
            break;
	case MENU_ITEM_ABOUT:
	     showAboutView();
	     break;
        case MENU_ITEM_BACK:
	     showGoBack();
	     break;
    }
}

Function for go back???  :confused: