var menues = 'm1'
function menutop(selec)
{
	document.getElementById(menues).style.display='none';
	document.getElementById(selec).style.display='inline';
	menues = selec;
}

var bandas = 'b1'
function menuleft(selec)
{
	document.getElementById(bandas).style.display='none';
	document.getElementById(selec).style.display='inline';
	bandas = selec;
}

var extra = 'b1'
function menuring(selec)
{
	document.getElementById(extra).style.display='none';
	document.getElementById(selec).style.display='inline';
	extra = selec;
}