// Toggle DIVs function - turns the display of any particular DIV to 'block' or 'none'
// depending on the current state of that DIV 
function tg(id){
	if (document.getElementById){
		if(document.getElementById(id).style.display == 'none'){
			document.getElementById(id).style.display = 'block';
		} else {
			document.getElementById(id).style.display = 'none';
		}
	} else if (document.all) {
		if (document.all[id].style.display == 'none') {
			document.all[id].style.display = 'block';
		} else {
			document.all[id].style.display = 'none';
		}
	}
}

function tgoff(id){
	if (document.getElementById){
		document.getElementById(id).style.display = 'none';
	} else if (document.all) {
		document.all[id].style.display = 'none';
	}
}

function tgstyle(el) {
	if (el) {
		if (el.name == 'open' && el.name != null) {
			el.className = 'navitemhover';
		}
		else 
		{
			if (el.className == 'navitem') {
				el.className = 'navitemhover';
			}
			else
			{
				el.className = 'navitem';
			}
		}
	}
}

function tgplusminus(el, imgname) {
	if (el) {
		if (el.name == 'open' && el.name != null) {
			imgSwap(imgname, minus);
		}
		else 
		{
			if (el.className == 'navitem') {
				imgSwap(imgname, blank);
			}
			else
			{
				imgSwap(imgname, plus);
			}
		}
	}
}

function tgstate(el) {
	if (el) {
		if (el.name == null || el.name == 'closed') {
			el.name = 'open';
		}
		else
		{
			el.name = 'closed';
		}
	}
}

function imgSwap(imgName, imgReplacement) {
	if (document.images) {
		document.images[imgName].src = imgReplacement.src;
	}
}