<!--
var curDiv = "about_layer";

function layerdisplay(newLayer) {
	var prevLayer = document.getElementById(curDiv); //look up by id in doc
	if(newLayer != null) {
		// Remove the previous block from the display
		prevLayer.style.display = 'none'; 
		// Get the new Layer and turn it on
		var myElement = document.getElementById(newLayer + "_layer");
		// We know it is a block element (changing from none)
		myElement.style.display = 'block';
		// We want it to be visible (it may hav been hidden by else, below)
		myElement.style.visibility = 'visible';
		// Remember previous layer to new layer
		curDiv = newLayer + "_layer";
	} else {
		// We don't want to display anything, but we need to keep the block
		// as a placeholder, so we just turn off its visibility
		prevLayer.style.visibility = 'hidden';
	}
			
} // end function
	
// -->