function neer11(){knop11.src='images/knop11in.jpg'}
function op11(){knop11.src='images/knop11.jpg'}
function neer12(){knop12.src='images/knop12in.jpg'}
function op12(){knop12.src='images/knop12.jpg'}
function neer13(){knop13.src='images/knop13in.jpg'}
function op13(){knop13.src='images/knop13.jpg'}
function neer14(){knop14.src='images/knop14in.jpg'}
function op14(){knop14.src='images/knop14.jpg'}
function neer15(){knop15.src='images/knop15in.jpg'}
function op15(){knop15.src='images/knop15.jpg'}

function neer32(){knop32.src='images/knop32in.jpg'}
function op32(){knop32.src='images/knop32.jpg'}
function neer33(){knop33.src='images/knop33in.jpg'}
function op33(){knop33.src='images/knop33.jpg'}
function neer34(){knop34.src='images/knop34in.jpg'}
function op34(){knop34.src='images/knop34.jpg'}

function neer41(){knop41.src='images/knop41in.jpg'}
function op41(){knop41.src='images/knop41.jpg'}
function neer42(){knop42.src='images/knop42in.jpg'}
function op42(){knop42.src='images/knop42.jpg'}
function neer43(){knop43.src='images/knop43in.jpg'}
function op43(){knop43.src='images/knop43.jpg'}

function neer51(){knop51.src='images/knop51in.jpg'}
function op51(){knop51.src='images/knop51.jpg'}
function neer52(){knop52.src='images/knop52in.jpg'}
function op52(){knop52.src='images/knop52.jpg'}
function neer53(){knop53.src='images/knop53in.jpg'}
function op53(){knop53.src='images/knop53.jpg'}
function neer54(){knop54.src='images/knop54in.jpg'}
function op54(){knop54.src='images/knop54.jpg'}

function verberg_alles()
{	menu1.style.visibility='hidden';
	menu3.style.visibility='hidden';
	menu4.style.visibility='hidden';
	menu5.style.visibility='hidden';
}

function over1()
{	verberg_alles();
	menu1.style.visibility='visible';
}

function over3()
{	verberg_alles();
	menu3.style.visibility='visible';
}

function over4()
{	verberg_alles();
	menu4.style.visibility='visible';
}

function over5()
{	verberg_alles();
	menu5.style.visibility='visible';
}