var currentImgId;

function show(imgId)
{
	hideDisplay(currentImgId);
	showDisplay(imgId);
	currentImgId = imgId;
}

function showDisplay(divId)
{
	var styleToChange = getStyle(divId);
	if (styleToChange) styleToChange.display = 'block';
}

function hideDisplay(divId)
{
	var styleToChange = getStyle(divId);
	if (styleToChange) styleToChange.display = '';
}

function getStyle(divId)
{
	if (!divId)
	{
		return null;
	}
	
	var styleToChange;
	if (document.getElementById)
	{
		// standard way
		styleToChange = document.getElementById(divId).style;
	}
	else if (document.all)
	{
		// old msie versions
		styleToChange = document.all[divId].style;
	}
	else if (document.layers)
	{
		// nn4 works
		styleToChange = document.layers[divId].style;
	}
	return styleToChange;
}