function thisNt()
{
	if (document.documentElement)
	{
	document.write("<div id\=\"thisNote\">");
	document.write("<h4>Explanation<\/h4>");
	document.write("The object <span class\=\"c13\"><strong>document.documentElement<\/strong><\/span> is the top object of the <acronym>DOM<\/acronym> tree structure.");
	document.write("<br \/>\x20<br \/>Browsers such as NetNav4 and Opera6, etc., will not recognize it. They should hop over this part of the script and enter the <strong>ELSE<\/strong> part of the script instead.");
	document.write("<div class\=\"c6\" style\=\"margin-top\:1em\;\">");
	document.write("\x5B<a class\=\"trans\" href\=\"javascript\:void\(0\)\;\"");
	document.write(" onclick\=\"closeNote\(\)\;return false\;\" keypress\=\"closeNote\(\)\;return false\;\">");
	document.write("Close this Note<\/a>\x5D<\/div>");
	document.write("<\/div>");
	return;
	}
}

function closeNote()
{
	document.getElementById("thisNote").style.display="none";
	location.href="#spec0";
}

function tellIF() 
{
	if (document.documentElement)
	{
	document.getElementById("thisNote").style.display="block";
	return; 
	}

	else
	{
	alert("The object \"document.documentElement\" is the top object of the DOM tree structure.\n\nBrowsers such as NetNav4 and Opera6, etc., will not recognize it and should jump over this part of the script.");
	}
}

function tellELSE() 
{
	alert("We are using the javascript alert object in the ELSE part of the script here, because it is an earlier javascript object. Earlier browser versions \(non-DOM\) should recognize it, enter this part of the script, and produce the effects.\n\nWe could write our material in an alert message, the same material that we would write for our DOM handled element. So, visitors with earlier \(non-DOM\) browsers could obtain the content in this mode of presentation.\n\nActually, the alert object is useful itself. We might want to use it sometimes for all of our javascript-enabled visitors, for everyone alike.");
}