function chowajmenu(id)
{
	var div1 = document.getElementById(id);
	var div2 = document.getElementById(id+"a");
	div1.style.display = 'none';
	div2.style.color = '#333332';
}

function pokazmenu(id)
{
	var div1 = document.getElementById(id);
	var div2 = document.getElementById(id+"a");
	div1.style.display = 'block';
	div2.style.color = '#ff9933';
}

function height_mid_cont()
{
	var wysokosc = document.getElementById('mid_cont').clientHeight;
	if(wysokosc<1000) document.getElementById('mid_cont').style.height = 1000;
}