var currLayer = 'c1'; // name of the currently displayed menu layer

divLayer = new Array(arrayLength);

for(i = 1; i <= arrayLength; i++){
	divLayer['c' + i] = new Boolean();
	divLayer['c' + i] = 0;
}

// show the referenced layer ...
function showDiv(layer) {
	var toHide = currLayer;
	if ( toHide != '') {
		hide(toHide);
	}
	show(layer);
	divLayer[layer] = 1;
	currLayer = layer
	return;
}