// - 
// ------------- general functions for portfolio atlas

function handleNavOver(imgName){
	swapImage(imgName, "/images/nav/"+imgName+"_over.gif");
}

function handleNavOut(imgName, isOn){
	if (isOn){
		swapImage(imgName, "/images/nav/"+imgName+"_on.gif");
	}
	else{
		swapImage(imgName, "/images/nav/"+imgName+".gif");
	}
}

function selectOver(imgName){
	swapImage(imgName, "/images/btn_select_over.gif");
}

function selectOut(imgName){
	swapImage(imgName, "/images/btn_select.gif");
}

function swapImage(imgName, newSrc){
	if (document.images){
		var img = document.images[imgName];
		if (img != null){
			img.src = newSrc;
		}
	}
}