/*
 * Change background of mainMenu left part to selected 
 */
function mainMenu_select(){
  document.getElementById('topNavLeft').style.backgroundImage = 'url(/assets/css/img/topNav_left_selected.jpg)';
}

/*
 * Change background of mainMenu left part to default 
 */
function mainMenu_unselect(){
  document.getElementById('topNavLeft').style.backgroundImage = 'url(/assets/css/img/topNav_left.jpg)';
}