function objGet(x) {
	if (typeof x != 'string') return x;
	else if (Boolean(document.getElementById)) return document.getElementById(x);
	else if (Boolean(document.all)) return eval('document.all.'+x);
	else return null;
}

function objSetStyle (obj,prop,val) {
	var o = objGet(obj);
	if (o && o.style) {
		eval ('o.style.'+prop+'="'+val+'"');
		return true;
		}
	else return false;
	}

function objShow (obj,on) {
	return objSetStyle(obj,'visibility',(on) ? 'visible':'hidden');
	}

function objDisplay (obj,on,type) {
	if (on && !type) type = 'block';
	return objSetStyle(obj,'display',(on) ? type:'none');
	}

menu = ["vzs", "vzs_ms", "etc"];

function menuShow(obj) {
	pocet = 3;
	var i = 0;
	while (i < pocet) {
		if (menu[i] == obj) {
			objDisplay(obj, 1);
		} else {
			objDisplay(menu[i], 0);
		}
		i++
	}
}
	
function colorChange(no) {
	var i = 0;
	while (i < 7) {
		i++;
		mnu = 'menu'+i;
		obj = 'menu'+no;
		if (mnu == obj) {
			objSetStyle(obj,'backgroundColor','#11385F');
		} else {
			objSetStyle(mnu,'backgroundColor','#7CA0C4');
		}
	}
}