function showhide(myblock,onoff)
{
	if (document.getElementById)
	{
		// this is the way the standards work
		var style2 = document.getElementById(myblock).style;
		style2.display = style2.display? "":onoff;
	}
	else if (document.all)
	{
		// this is the way old msie versions work
		var style2 = document.all[myblock].style;
		style2.display = style2.display? "":onoff;
	}
	else if (document.layers)
	{
		// this is the way nn4 works
		var style2 = document.layers[myblock].style;
		style2.display = style2.display? "":onoff;
	}
}