function showDiv(divname){
	//hide divs
	for (var i = 1; i < document.getElementById('subnav').childNodes.length; i++){
		if (document.getElementById('subnav').childNodes[i].nodeName=="DIV"){
			document.getElementById('subnav').childNodes[i].style.display = "none";
		}
	}
	//show appropriate div
	thediv = document.getElementById('Div' + divname);
	if (thediv.style.display=="none"){
		thediv.style.display="block";
	}
}

function imgChange(imgName){
	theImg = document.getElementById('header_'+imgName).childNodes[0];
	ImgExt = theImg.src.split("_");
	if (ImgExt[1] == "off.gif"){
		theImg.src = "images/nav/"+imgName+"_on.gif";
	}else if (ImgExt[1] == "on.gif"){
		theImg.src = "images/nav/"+imgName+"_off.gif";
	}
}

function subimgChange(imgName,ParentImg){
	theImg = document.getElementById(imgName);
	theParentImg = document.getElementById('header_'+ParentImg).childNodes[0];
	ImgExt = theImg.src.split("_");
	if (ImgExt[1] == "off.gif"){
		theImg.src = "images/nav/"+imgName+"_on.gif";
		theParentImg.src = "images/nav/"+ParentImg+"_on.gif";
	}else if (ImgExt[1] == "on.gif"){
		theImg.src = "images/nav/"+imgName+"_off.gif";
		theParentImg.src = "images/nav/"+ParentImg+"_off.gif";
	}
}