// JavaScript Document
// Choose between gif or png images to swap
if (document.images) {
	NavOn1 = new Image()
	NavOn1.src = "images/nav/sustainability_ON.png"
	//NavOn2 = new Image()
	//NavOn2.src = "images/nav/leedprogram_ON.png"
	NavOn2 = new Image()
	NavOn2.src = "images/nav/ecofriendly_ON.png"
	NavOn3 = new Image()
	NavOn3.src = "images/nav/lifecycle_ON.png"
	NavOn4 = new Image()
	NavOn4.src = "images/nav/contactus_ON.png"
	
	NavOff1 = new Image()
	NavOff1.src = "images/nav/sustainability.png"
	//NavOff2 = new Image()
	//NavOff2.src = "images/nav/leedprogram.png"
	NavOff2 = new Image()
	NavOff2.src = "images/nav/ecofriendly.png"
	NavOff3 = new Image()
	NavOff3.src = "images/nav/lifecycle.png"
	NavOff4 = new Image()
	NavOff4.src = "images/nav/contactus.png"
	
	GIFNavOn1 = new Image()
	GIFNavOn1.src = "images/nav/sustainability_ON.gif"
	//GIFNavOn2 = new Image()
	//GIFNavOn2.src = "images/nav/leedprogram_ON.gif"
	GIFNavOn2 = new Image()
	GIFNavOn2.src = "images/nav/ecofriendly_ON.gif"
	GIFNavOn3 = new Image()
	GIFNavOn3.src = "images/nav/lifecycle_ON.gif"
	GIFNavOn4 = new Image()
	GIFNavOn4.src = "images/nav/contactus_ON.gif"
	
	GIFNavOff1 = new Image()
	GIFNavOff1.src = "images/nav/sustainability.gif"
	//GIFNavOff2 = new Image()
	//GIFNavOff2.src = "images/nav/leedprogram.gif"
	GIFNavOff2 = new Image()
	GIFNavOff2.src = "images/nav/ecofriendly_ON.gif"
	GIFNavOff3 = new Image()
	GIFNavOff3.src = "images/nav/lifecycle.gif"
	GIFNavOff4 = new Image()
	GIFNavOff4.src = "images/nav/contactus.gif"
	
					  }

function SwapImage(which,what) 
		{
		eval('document.images["' + which + '"].src =  ' + what + '.src');
		}

function changeMainNav(nav,state) 
	{
//		if (pngAlpha) {
		if ((browser.isIE && browser.versionMinor <=6.9) && browser.isWin32) {
			theImage = ("nav" + nav);
			theState = (state) ? ("GIFNavOn"+nav) : ("GIFNavOff"+nav);
			SwapImage(theImage,theState);
		} else if ((browser.isGecko) || (browser.isIE5up && browser.isMac) || (browser.isOpera && browser.isWin && browser.versionMajor >= 6) || (browser.isOpera && browser.isUnix && browser.versionMajor >= 6) || (browser.isOpera && browser.isMac && browser.versionMajor >= 5) || (browser.isOmniweb && browser.versionMinor >= 3.1) || (browser.isIcab && browser.versionMinor >= 1.9) || (browser.isWebtv) || (browser.isDreamcast) || (browser.isIE && browser.versionMinor >=7)) {
			theImage = ("nav" + nav);
			theState = (state) ? ("NavOn"+nav) : ("NavOff"+nav);
			SwapImage(theImage,theState);
		} else {
			theImage = ("nav" + nav);
			theState = (state) ? ("GIFNavOn"+nav) : ("GIFNavOff"+nav);
			SwapImage(theImage,theState);
		}
	}