="backtick">None</tt> if the user gave no argument. <span class="anchor" id="line-178"></span><span class="anchor" id="line-179"></span><p class="line874">Consider this example macro: <span class="anchor" id="line-180"></span><span class="anchor" id="line-181"></span><span class="anchor" id="line-182"></span><span class="anchor" id="line-183"></span><span class="anchor" id="line-184"></span><div class="codearea" dir="ltr" lang="en">
<script type="text/javascript">
document.write('<a href="#" onclick="return