lastPage = 20

var html = ""
if (thisPage > 1) {
	html += "<A CLASS='maintext' HREF='virtual" + (thisPage-1) +".shtml'><< BACK</A>"
		 +  " "
}

	html += " | <A CLASS='maintext' HREF='virtual.shtml'>INDEX</A> | "

if (thisPage < lastPage) {
	html += "<A CLASS='maintext' HREF='virtual" + (thisPage+1) +".shtml'>NEXT >></A>"
}

if (document.all["back_next_links"] && html.length > 0) document.all["back_next_links"].innerHTML = html