var selectedEl = null;

function initMainMenu()
{
    $('#mainMenuItems a').mouseenter( function()
    {
        //save selected
        if( selectedEl == null )
            selectedEl = $('#mainMenuItems li.selected');
        
        menuID = $(this).parent().attr('id');
        submenuSelectorName = '#si_' + menuID;
        hideMainMenuItems();
        
        $(this).parent().addClass( 'selected' );
        
        var version = $.browser.version;
        var ifIE = ( $.browser.msie ) ? true : false;
        if( ifIE )
            $( submenuSelectorName ).show();
        else
            $( submenuSelectorName ).fadeIn( 300 );
    });
}

function hideMainMenuItems()
{
    $('#mainMenuItems li').removeClass('selected');
    $('.mainMenuSubitems').hide();
    
    //restore selected
    selectedEl.addClass( 'selected' );
}