function change_td(which, c)
{
	var schatten = "schatten_" + which;
	
	if(c == 1)
	{
		document.getElementById(which).style.backgroundColor = "#ffffff";
		
		if(document.getElementById(schatten))
		{
			document.getElementById(schatten).src = "pics/spacer.gif";
			document.getElementById(schatten).style.backgroundColor = "#ffffff";
		}
	}
	else
	{
		document.getElementById(which).style.backgroundColor = "";
		
		if(document.getElementById(schatten))
		{
			document.getElementById(schatten).src = "pics/menu_schatten_rechts.gif";
		}
	}
}