function alternate(id)
{
	if(document.getElementsByTagName)
	{
		var table = document.getElementById(id);
		var rows = table.getElementsByTagName("tr");
		
		for(i = 0; i < rows.length; i++)
		{
			if(i % 2 == 0)
			{
				rows[i].className = "alternate";
			}
		}
	}
}