function changeTab(i) 
{
	for (x = 1; x < 7; x++)
	{
		var contentBox = "content" + x;
		var tabBox = "tab" + x;
		var textBox = "tabText" + x;
		
		if (i == x)
		{
			document.getElementById(contentBox).style.display = "block";
			document.getElementById(tabBox).className = "current";
		}
		// show content, change tab appearance
		else
		{
			document.getElementById(contentBox).style.display = "none";
			document.getElementById(tabBox).className = "";
		// don't show, change tab appearance
		}
	}
}