function quoted(str) {
  return (str != null) ? '"' + str + '"' : '""';
}

iframe_width = 510;
iframe_height = 420;
iframe_frameborder = 0;
iframe_src = 'http://www.virtualquiz.com/quiz_start.php?idgame=' + quiz_idgame + '&quiz_url=' + document.location;

document.write('<ifr' + 'ame' +
			 ' name="quiz"' +
			 ' width=' + quoted(iframe_width) +
			 ' height=' + quoted(iframe_height) +
			 ' frameborder=' + quoted(iframe_frameborder) +
			 ' src=' + quoted(iframe_src) +
			 ' marginwidth="0"' +
			 ' marginheight="0"' +
			 ' vspace="0"' +
			 ' hspace="0"' +
			 ' allowtransparency="true"' +
			 ' scrolling="no">');
document.write('</ifr' + 'ame>');