function butover(id) {
	l_1 = document.images['button_'+id+'_1'];
         l_2 = document.images['button_'+id+'_2'];
         l_1.src = 'http://gymn.paide.ee/gfx/button_over.jpg';
         l_2.src = 'http://gymn.paide.ee/gfx/button_over.jpg';
}

function butout(id) {
	l_1 = document.images['button_'+id+'_1'];
         l_2 = document.images['button_'+id+'_2'];
         l_1.src = 'http://gymn.paide.ee/gfx/button_out.jpg';
         l_2.src = 'http://gymn.paide.ee/gfx/button_ou