//////////////////////////////////////////////////////////////////////////
// Open a main nav dropdown
//////////////////////////////////////////////////////////////////////////
function menu( cat, effect, delay ) {
    if (typeof(effect_queue) != 'undefined'){ clearTimeout(effect_queue); };
    menu_name = cat + '_menu';
    myEffect = effect;
    timeDelay = delay;
    if( effect == "show_menu" ){
        menu_height = $(menu_name).getDimensions().height ? $(menu_name).getDimensions().height : 3;
        menu_width = $(menu_name).getDimensions().width ? $(menu_name).getDimensions().width : 4;
        $(menu_name).setStyle({display: "block"});
        var coord = $(cat).cumulativeOffset();
        var h_space = coord[0];
        var v_space = coord[1] + $(cat).getHeight();
        $(menu_name).setStyle({top: v_space+'px', left: h_space+'px'});
        $('drop_shim').setStyle({display: "block", top: v_space+'px', left: h_space+'px', height: menu_height - 3 + 'px', width: menu_width - 4 + 'px'});
        $(cat).addClassName('hover');

    }
    else if( effect == "hide_menu" ){
        $(cat).removeClassName('hover');
        $(menu_name).hide();
        $('drop_shim').hide();
    }
}