var ie4 = (document.all) ? true : false;
var ns4 = (document.layers) ? true : false;
var ns6 = (document.getElementById && !document.all) ? true : false;

function hideLayer(lay)
{
	if (ie4) {document.all[lay].style.visibility = "hidden";}
	if (ns4) {document.layers[lay].visibility = "hide";}
	if (ns6) {document.getElementById([lay]).style.display = "none";}
}

function showLayer(lay)
{
	if (ie4) {document.all[lay].style.visibility = "visible";}
	if (ns4) {document.layers[lay].visibility = "show";}
	if (ns6) {document.getElementById([lay]).style.display = "block";}
}

function writeToLayer(lay, txt)
{
	if (ie4)
	{
		document.all[lay].innerHTML = txt;
	}

	if (ns4)
	{
		document[lay].document.write(txt);
		document[lay].document.close();
	}

	if (ns6)
	{
		over = document.getElementById([lay]);
		range = document.createRange();
		range.setStartBefore(over);
		domfrag = range.createContextualFragment(txt);

		while (over.hasChildNodes())
		{
			over.removeChild(over.lastChild);
		}
		
		over.appendChild(domfrag);
	}
}

function popupEmail(to, email, page)
{
	var windowProperties = "toolbar=no,directories=no,resizable=no,location=no,status=no,menubar=no,scrollbars=yes,top=25,left=25,width=400,height=610";
	var urlParams = "?To=" + to + "&Email=" + email;
	
	newPage = window.open(page + urlParams, "newPage", windowProperties);
	newPage.focus();
}

function popupSubscription(page)
{
	var windowProperties = "toolbar=no,directories=no,resizable=no,location=no,status=no,menubar=no,scrollbars=yes,top=50,left=50,width=625,height=625";
	
	newPage = window.open(page, "newPage", windowProperties);
	newPage.focus();
}