function displayGallery(strTitle, lesson_index, num_pic, file_format) {
	document.write("<table cellspacing=0 cellpadding=4 border=0 align='center'>");
	document.write("<tr><td colspan=4><p align='center'>");
	document.write("<FONT COLOR='#0000FF' FACE='Bookman Old Style' SIZE='5'>");
	document.write(strTitle);
	document.write("</font></b></p><hr></td></tr>");
	document.write("<tr>");
	for(var i=1; i<=num_pic; i++) {
		document.write("<td><a href='", lesson_index, "-", i, "_", num_pic, ".", file_format, "'>");
		document.write("<img border='0' width='200' src='", lesson_index, "-", i, "_", num_pic, ".", file_format, "'></td>");
		if (i%4==0) {
			document.write("</tr><tr>");
		}
	}
	document.write("</tr>");
	document.write("<tr><td colspan=4><hr></td></tr></table>");
}