вместо
<li onclick="finddiv(); javascript: document.getElementById('jsneck').style.background Image=='url(http://192.168.1.150/web/body0.png)'; "> Open Neck </li>
нужно
<li onclick="finddiv(); document.getElementById('jsneck').style.backgroundImage='url(http://192.168.1.150/web/body0.png)'; "> Open Neck </li>