function chat_mode(mode, _reload) {

    if (mode == '') mode = 'expand';

    // write to cookie
    setcookie("chat_mode", mode, '', '/');

    // reload
    if (_reload) location.reload();
    
    
    if (mode == 'collapse') {
        $('chat_frame').style.display = 'none';
        
        $('chat').style.width = '175';
        $('chat').style.height = '26';
        
        $('chat_expand').style.display = 'inline';
        $('chat_collapse').style.display = 'none';
        $('chat_fullscreen').style.display = 'inline';

    }
    
    if (mode == 'close') {
    
        if ($('chat_frame')) $('chat_frame').style.display = 'none';
        
        $('chat').style.width = '175';
        $('chat').style.height = '26';
        
        $('chat_enter').style.display = 'inline';
        $('chat_control').style.display = 'none';
        
    }
    
    if (mode == 'fullscreen') {
        $('chat_frame').style.display = 'block';
        $('chat_frame').style.width = '100%';
        
        $('chat').style.height = '550';
        $('chat').style.width = '100%';
        
        $('chat_fullscreen').style.display = 'none';
        $('chat_collapse').style.display = 'inline';
        $('chat_expand').style.display = 'inline';
        
    }
    
    if (mode == 'expand') {
        $('chat_frame').style.display = 'block';
        
        $('chat').style.width = '300';
        $('chat').style.height = '550';
        
        $('chat_expand').style.display = 'none';
        $('chat_fullscreen').style.display = 'inline';
        $('chat_collapse').style.display = 'inline';
        
    }
    
}