modify password field

configure_thurvserver.tpl

@@ -320,7 +320,7 @@ var _localLang = {
                                         <label for="customfield{$customfields[2].id}">{$customfields[2].name}</label>
                                         {$customfields[2].input}
                                         {if $customfields[2].description}
-                                            <span class="field-help-text" onclick="this.previousSibling.type='text'">
+                                            <span class="field-help-text" onclick="this.previousElementSibling.type='text'">
                                                 &#x1F441; {$customfields[2].description}
                                             </span>
                                         {/if}