function swap(id)
{
	var arrContents = new Array ("cnt1", "cnt2", "cnt3", "cnt4", "cnt5", "cnt6", "cnt7", "cnt8", "cnt9");
	var arrButtons = new Array ("btn1", "btn2", "btn3", "btn4", "btn5", "btn6", "btn7", "btn8", "btn9");
	
	for (i = 0; i < arrButtons.length; i++)
	{
		var content = document.getElementById(arrContents[i]);
		var button = document.getElementById(arrButtons[i]);
		if (arrButtons[i] == id)
		{
			if (button && content)
			{
				button.className = "selected";
				content.style.display = 'block';
			}
		}
		else
		{
			if (button && content)
			{
				button.className = "";
				content.style.display = 'none';
			}
		}
	}
}