ul#m_root {width: 150px}
ul#m_linux {width: 150px}
ul#m_comp {width: 100px}
ul#m_web {width: 120px}
ul#m_notes {width: 120px}
ul#m_net   {width: 150px}
ul li {background-image: url(images/button_bg.png); background-repeat: repeat-x}
ul li.over {background-image: url(images/button_over.png); background-repeat: repeat-x}