function setBGcolor(object) {
   if(object.className == 'mainmenu_1') object.className= 'mainmenu_1_focus';
   if(object.className == 'leftmenu') object.className= 'leftmenu_focus';
}

function setBGcolorBack(object) {
   if(object.className == 'mainmenu_1_focus') object.className= 'mainmenu_1';
   if(object.className == 'leftmenu_focus') object.className= 'leftmenu';
}