function show_sub(a) {
	document.getElementById('menu1').innerHTML = '';
	document.getElementById('menu2').innerHTML = '';
	document.getElementById('menu3').innerHTML = '';
	document.getElementById('menu4').innerHTML = '';
	document.getElementById('menu5').innerHTML = '';
	document.getElementById('menu6').innerHTML = '';
	
	document.getElementById('img1').src = 'images/galka1.gif';
	document.getElementById('img2').src = 'images/galka1.gif';
	document.getElementById('img3').src = 'images/galka1.gif';
	document.getElementById('img4').src = 'images/galka1.gif';
	document.getElementById('img5').src = 'images/galka1.gif';
	document.getElementById('img6').src = 'images/galka1.gif';
	
	el = document.getElementById('cont' + a);
	el2 = document.getElementById('menu' + a);
	el3 = document.getElementById('img' + a);
	el2.innerHTML = el.innerHTML;
	el3.src = "images/galka2.gif";
	
}