ns4 = (document.layers)? true:false;
ie4 = (document.all)? true:false;

// init
function init() {
	if (ns4) block = document.blockDiv;
	if (ie4) block = blockDiv.style;
}

// show objeto
function showObject(obj) {
	if (ns4) obj.visibility = "show"
	else if (ie4) obj.visibility = "visible"
}

// hide objeto
function hideObject(obj) {
	if (ns4) obj.visibility = "hide"
	else if (ie4) obj.visibility = "hidden"
}

// Show/Hide functions for non-pointer layer/objects
function show(id) {
	if (ns4) document.layers[id].visibility = "show"
	else if (ie4) document.all[id].style.visibility = "visible"
}

function hide(id) {
	if (ns4) document.layers[id].visibility = "hide"
	else if (ie4) document.all[id].style.visibility = "hidden"
}

// layer writer
function layerWrite(id,nestref,text) {
	if (ns4) {
		var lyr = (nestref)? eval('document.'+nestref+'.document.'+id+'.document') : document.layers[id].document;
		lyr.open();
		lyr.write(text);
		lyr.close();
	}
	else if (ie4) document.all[id].innerHTML = text;
}