I will like hide a section of php script with an hyperlink to hide by default and show on click?

Question

I would like to hide the bold and italic potion of the script below so that when I click a link tag echo "Advanced Search"; the potion will open and when I click the same link it will close;

<?php
echo "<div class='container'>
  <br>
  <form action='search.php' method='get'>
  <input type='text' name='query' id='keyword' size='45' style='height:21px' value='"
  .htmlentities($query, ENT_QUOTES, 'UTF-8')
  ."' autocomplete='on'>
  <div id='sresults'></div>
  <input type='submit' class='button' style='height:21px' value='"
  .$sph_messages['Search']
    ."'><br><br>";
/** I would like to hide from this point down with the link <a href='#' class=''>Advanced Search</a>" **/
if ($adv==1 || $advanced_search==1) {
echo "<div class='advanced'>
  <div class='left'>";
echo "<input type='radio' name='type' value='and' ";
echo strip_tags($type)=='and'?'checked':'';
echo ">"
  .$sph_messages['andSearch']
  ."<br><br>";
echo "<input type='radio' name='type' value='phrase' ";
echo strip_tags($_REQUEST['type'])=='phrase'?'checked':'';
echo ">"
  .$sph_messages['phraseSearch']
  ."</div>
  <div class='right'>";
echo "<input type='radio' name='type' value='or' ";
echo strip_tags($_REQUEST['type'])=='or'?'checked':'';
echo ">"
  .$sph_messages['orSearch']
  ."<br><br>"
  .$sph_messages['show']
  ."<select name='results'>
  <option ";