function knacki(x) {
if(x==20){
	li1 = document.getElementById('li_12');
	x = li1.getElementsByTagName("ul");
	x[0].style.display = "none";
	
	li2 = document.getElementById('li_3');
	y = li2.getElementsByTagName("ul");
	y[0].style.display = "none";

	}
if(x==12){
	li1 = document.getElementById('li_20');
	x = li1.getElementsByTagName("ul");
	x[0].style.display = "none";
	
	li2 = document.getElementById('li_3');
	y = li2.getElementsByTagName("ul");
	y[0].style.display = "none";
	
	}
	
if(x==3){
	li1 = document.getElementById('li_20');
	x = li1.getElementsByTagName("ul");
	x[0].style.display = "none";
	
	li2 = document.getElementById('li_12');
	y = li2.getElementsByTagName("ul");
	y[0].style.display = "none";
	
	}
}

function knacko(x) {
if(x==20){
	li1 = document.getElementById('li_12');
	x = li1.getElementsByTagName("ul");
	x[0].style.display = "block";
	
	li2 = document.getElementById('li_3');
	y = li2.getElementsByTagName("ul");
	y[0].style.display = "block";
	
	}
if(x==12){
	li1 = document.getElementById('li_20');
	x = li1.getElementsByTagName("ul");
	x[0].style.display = "block";
	
	li2 = document.getElementById('li_3');
	y = li2.getElementsByTagName("ul");
	y[0].style.display = "block";
	}
	
if(x==3){
	li1 = document.getElementById('li_20');
	x = li1.getElementsByTagName("ul");
	x[0].style.display = "block";
	
	li2 = document.getElementById('li_12');
	y = li2.getElementsByTagName("ul");
	y[0].style.display = "block";
	}
}