// Choose a different style sheet each day, at random, from the list of possible colours
function chooseStyleSheet() {
	colours= new Array("purple","yellow","pink","blue","orange","red","sky","green","cerise");
	numColours=colours.length;
	var thisColourNum = Math.floor ((Math.random() * numColours));
	document.writeln('<link rel="stylesheet" type="text/css" href="/css_js_inc/IX' + colours[thisColourNum] + '/ix.css">');
}