var cur_lyr;
cur_lyr = 'pageLayer';

function swapLayerss(id) {
	if (cur_lyr){
		hideLayer(cur_lyr);
		cur_lyr = 0;
	} else {
		showLayer(id);
		cur_lyr = id;
	}
}

function showLayer(id) {
	var lyr = getElemRefs(id);
	if (lyr && lyr.css) lyr.css.visibility = "visible";
}

function hideLayer(id) {
	var lyr = getElemRefs(id);
	if (lyr && lyr.css) lyr.css.visibility = "hidden";
}

function getElemRefs(id) {
	var el = (document.getElementById)? document.getElementById(id): (document.all)? document.all[id]: (document.layers)? document.layers[id]: null;
	if (el) el.css = (el.style)? el.style: el;
	return el;
}