function changeText(id,text)
{
	var el = document.getElementById(id);
	el.removeChild(el.childNodes[0]);
	el.appendChild(document.createTextNode(text));
}

function hideText(id)
{
	hide(id);
	show('blank');
}

function showText(id)
{
	hide('blank');
	show(id);
}

function hide(id)
{
	var el = document.getElementById(id);
	el.style.display = 'none';
}

function show(id)
{
	var el = document.getElementById(id);
	el.style.display = 'block';
}