Index: options-permalink.php
===================================================================
--- options-permalink.php	(revision 3645)
+++ options-permalink.php	(working copy)
@@ -31,6 +31,7 @@
 inputs = inputs.substr(0,inputs.length - 1);
 if ( 'custom' != inputs )
 structure.value = inputs;
+togglehelp();
 }
 
 function blurry() {
@@ -44,8 +45,22 @@
 for (var i = 0; i < aInputs.length; i++) {
 aInputs[i].onclick = aInputs[i].onkeyup = upit;
 }
+
+var link = document.getElementById('custom_selection');
+var help = document.getElementById('cp_help');
+if(!link.checked) help.className = 'zerosize';
 }
 
+function togglehelp() {
+var help = document.getElementById('cp_help');
+var link = document.getElementById('custom_selection');
+if(link.checked) {
+	help.className = '';
+} else {
+	help.className = 'zerosize';
+}
+}
+
 window.onload = blurry;
 //]]>
 </script>
@@ -145,6 +160,22 @@
 </label>
 <br />
 </p>
+<div id="cp_help" class="cp_help">
+<p><?php _e('WordPress permalink structures are made up of variables, typically separated by forward-slashes. Some variables you can use are:'); ?></p>
+<ul>
+	<li><code>%post_id%</code> &mdash; <?php _e('the numeric ID of the page'); ?></li>
+	<li><code>%year%</code> &mdash; <?php _e('the year the entry was posted'); ?></li>
+	<li><code>%monthnum%</code> &mdash; <?php _e('the numeric form of the month in which the entry was posted'); ?></li>
+	<li><code>%day%</code> &mdash; <?php _e('the numeric form of the day of the month on which the entry was posted'); ?></li>
+	<li><code>%postname%</code> &mdash; <?php _e("the post's slug"); ?></li>
+</ul>
+<p><?php _e('Some tips for creating your own permalink structure:'); ?></p>
+<ul>
+	<li><?php _e('Be sure to end your permalinks with something unique to each post, like <code>%postname%</code> or <code>%post_id%</code>.'); ?></li>
+	<li><?php _e("If you don't have <code>mod_rewrite</code> installed, you can start your permalink structure with <code>/index.php/</code> and WordPress will try to bypass the need for <code>mod_rewrite</code>."); ?></li>
+</ul>
+<p><?php _e(sprintf('For more detailed information, check <a href="%s">the Codex</a>.', 'http://codex.wordpress.org/Using_Permalinks')); ?></p>
+</div>
 <p id="customstructure"><?php _e('Custom structure'); ?>: <input name="permalink_structure" id="permalink_structure" type="text" class="code" style="width: 60%;" value="<?php echo $permalink_structure; ?>" size="50" /></p>
 
 <h3><?php _e('Optional'); ?></h3>