// changes menu link text colour and the table cell bakground colour
// n = button number
// col1 = cell background colour
// col2 = link text colour
function setbgColor(n,col1,col2) {
	if (document.getElementById) { 
		document.getElementById("nav"+n).style.backgroundColor=col1
		document.getElementById("link"+n).style.color=col2
		document.getElementById("link"+n).style.textDecoration="none"
	}
}