function switchMenu(obj,plus,minus) {
var el = document.getElementById(obj);
var pl = document.getElementById(plus);
var ml = document.getElementById(minus);
if ( el.style.display != 'none') {
el.style.display = 'none';
pl.style.display = 'none';
ml.style.display = '';
}
else {

el.style.display = '';
pl.style.display = '';
ml.style.display = 'none';
}
}