function change_color(div_id){document.getElementById(div_id).style.background='#dddddd';}
function change_color_back(div_id){document.getElementById(div_id).style.background='#ffffff';}
function show_menu(div_id){document.getElementById(div_id).style.display='block';}
function hide_menu(div_id){document.getElementById(div_id).style.display='none';}
function change_bg_back(div_id){document.getElementById(div_id).style.background='url(http://trydinair.com/magento_test/skin/frontend/default/dinair/images/bg_header.gif) repeat-x';}