Overview
    
    Creating a new theme is very easy. You need to describe window's look and feel in a CSS file. Name your CSS file THEME_NAME.css with thoses CSS definition:
    By convention the images used in the CSS files are in THEME_NAME directory (it's just a convention, do it as you feel!)
    A window is divided into 9 parts, 4 corners, 4 borders and the main content in the middle.
    View a detail 
template CSS file (you can copy-paste it to start a new theme). See 
Art.Gnome.Org for cool designs. I used two of them, it's easy to integrate in the class.
    
      /* North-West corner */
    .THEME_NAME_nw {
      background: transparent url(THEME_NAME/TOP_LEFT_IMAGE.gif) no-repeat 0 0;         
      width:10px;
      height:25px;
    }
    
    /* North border */
    .THEME_NAME_n {
      background: transparent url(THEME_NAME/TOP_IMAGE.gif) repeat-x 0 0;           
      height:25px;
    }
    
    /* North-East corner */
    .THEME_NAME_ne {
      background: transparent url(THEME_NAME/TOP_RIGHT_IMAGE.gif) no-repeat 0 0;            
      width:10px;     
      height:25px;
    }
    
    /* West border */
    .THEME_NAME_w {
      background: transparent url(THEME_NAME/LEFT_IMAGE.gif) repeat-y top left;         
      width:7px;
    }
    
    /* East border */
    .THEME_NAME_e {
      background: transparent url(THEME_NAME/RIGHT_IMAGE.gif) repeat-y top right;           
      width:7px;      
    }
    
    /* South-West corner */
    .THEME_NAME_sw {
      background: transparent url(THEME_NAME/BOTTOM_LEFT_IMAGE.gif) no-repeat 0 0;          
      width:7px;
      height:7px;
    }
    
    /* South border */
    .THEME_NAME_s {
      background: transparent url(THEME_NAME/BOTTOM_IMAGE.gif) repeat-x 0 0;            
      height:7px;
    }
    
    /* South-East corner */
    .THEME_NAME_se {
      background: transparent url(THEME_NAME/BOTTOM_RIGHT_IMAGE.gif) no-repeat 0 0;         
      width:7px;
      height:7px;
      vertical-align:top;
    }
    
    /* Resize button */
    .THEME_NAME_sizer {
      width:7px;
      height:7px;
        background: transparent url(THEME_NAME/RESIZE_IMAGE.gif) no-repeat 0 0; 
        cursor:se-resize;   
    }
    
    /* Close button */
    .THEME_NAME_close {
        width: 23px;
        height: 23px;
        background: transparent url(THEME_NAME/CLOSE_IMAGE.gif) no-repeat 0 0;          
        position:absolute;
        top:0px;
        right:11px;
        cursor:pointer;
        z-index:1000;
    }
    
    /* Minimize button */
    .THEME_NAME_minimize {
        width: 23px;
        height: 23px;
        background: transparent url(THEME_NAME/MINIMIZE_IMAGE.gif) no-repeat 0 0;           
        position:absolute;
        top:0px;
        right:55px;
        cursor:pointer;
        z-index:1000;
    }
    
    /* Maximize button */
    .THEME_NAME_maximize {
        width: 23px;
        height: 23px;
        background: transparent url(THEME_NAME/MAXIMIZE_IMAGE.gif) no-repeat 0 0;           
        position:absolute;
        top:0px;
        right:33px;
        cursor:pointer;
        z-index:1000;
    }
    
    /* Title bar */
    .THEME_NAME_title {
        float:left;
        height:14px;
        font-size:14px;
        text-align:center;
        margin-top:2px;
        width:100%;
        color:#123456;
    }
    
    /* Content div (not used for url) */
    .THEME_NAME_content {
        overflow:auto;
        color: #000;
        font-family: Tahoma, Arial, sans-serif;
        font-size: 10px;
        background:#FDFDFD;
    }
    
    /* Overlay for modal window, spécify color and opacity (three times to work on all browsers */
    .overlay_THEME_NAME {
      background-color: #85BBEF;
      filter:alpha(opacity=60);
      -moz-opacity: 0.6;
      opacity: 0.6;
    }
    
    
    
    
    
    Take a look to an existing CSS file like 
alphacube.css or 
mac_os_x.css (with PNG image and IE specific code)
  
  
Themes included in this release
  
    - Default ()
- MacShadow ()
- Lighting (from Emanuel Mila) ()
- Nuncio (from Brice Joly) ()
- Alphacube from Art.Gnome.Org ()
- Spread (Alphacube with a different color scheme) ()
- DarkX from Art.Gnome.Org ()
- Lighting from Mila ()
    - Default dialog ()
- Alphacube as dialog ()