function checkKeyCode(e)
{
	var charCode = e.keyCode;
	
	if (charCode == 13)
		return false;
	else
		return true;
}

function changeZeme()
{
	zeme = document.getElementById('zeme');
	zemeID = zeme.options[zeme.selectedIndex].value;
	oblast = document.getElementById('oblast');
	oblastID = 'zeme' + zemeID;
	misto = document.getElementById('misto');;
	
	hodnoty = eval(oblastID);
	delka = hodnoty.length/2;
	
	for (i=oblast.options.length-1; i>0; i--)
	{
		oblast.remove(i);
	}
	
	for (i=0; i<delka; i++)
	{
		position = i*2;
		
		id = hodnoty[position];
		nazev = hodnoty[position+1];
		
		oblast.options[i+1] = new Option(nazev, id, false, false);
	}
	
	for (i=misto.options.length-1; i>0; i--)
	{
		misto.remove(i);
	}
}

function changeOblast()
{
	oblast = document.getElementById('oblast');
	oblastID = oblast.options[oblast.selectedIndex].value;
	misto = document.getElementById('misto');
	mistoID = 'oblast' + oblastID;
	
	hodnoty = eval(mistoID);
	delka = hodnoty.length/2;
	
	for (i=misto.options.length-1; i>0; i--)
	{
		misto.remove(i);
	}
	
	for (i=0; i<delka; i++)
	{
		position = i*2;
		
		id = hodnoty[position];
		nazev = hodnoty[position+1];
		
		misto.options[i+1] = new Option(nazev, id, false, false);
	}
}