var shaded = '#334880';
var unshaded = '#7e9ff8';

var buttonNum = new Array('zero','one','two','three','four','five','six','seven','eight','nine','ten','eleven','twelve','thirteen','fourteen','fifteen','sixteen','seventeen','eighteen','nineteen','twenty');

function shade(num)
{
	if(num < buttonNum.length) {
		if(is_nav4) {
			document.layers[buttonNum[num]].style.backgroundColor = shaded;
		} else {
			document.getElementById(buttonNum[num]).style.backgroundColor = shaded;
		}
	}
}

function unshade(num)
{
	if(num < buttonNum.length) {
		if(is_nav4) {
			document.layers[buttonNum[num]].style.backgroundColor = unshaded;
		} else {
			document.getElementById(buttonNum[num]).style.backgroundColor = unshaded;
		}
	}
}


var spanNum = new Array('spanZero','spanOne','spanTwo','spanThree','spanFour','spanFive','spanSix','spanSeven','spanEight','spanNine');

function showLinks(num)
{
	if(num < spanNum.length) {
		if(is_nav4) {
			document.layers[spanNum[num]].style.visibility = 'visible';
			document.layers[spanNum[num]].style.zIndex = 1;
		} else {
			document.getElementById(spanNum[num]).style.visibility = 'visible';
			document.getElementById(spanNum[num]).style.zIndex = 1;
		}
	}
}

function hideLinks(num)
{
	if(num < spanNum.length) {
		if(is_nav4) {
			setTimeout("document.layers[spanNum[num]].style.visibility = 'hide'", 2500);
			document.layers[spanNum[num]].style.zIndex = -1;
		} else {
			document.getElementById(spanNum[num]).style.visibility = 'hidden';
			document.getElementById(spanNum[num]).style.zIndex = -1;
		}
	}
}