function switchMenu(obj1, obj2, obj3) {
var el = document.getElementById(obj1);
if ( el.style.display != 'none' ) {
el.style.display = 'none';
document.getElementById(obj2).innerHTML='<img hspace="3" src="/NOKIA_CHINA_72/Get_Support/Learn_how/images_4tabs/tab3/btn_plus.gif" align="absMiddle" border="0">'+obj3;
}
else {
el.style.display = '';
document.getElementById(obj2).innerHTML='<img hspace="3" src="/NOKIA_CHINA_72/Get_Support/Learn_how/images_4tabs/tab3/btn_minus.gif" align="absMiddle" border="0">'+obj3;
}
}