Why jQuery might not work on Drupal7?

Question

Drupal

tell me pliz what could be the matter, the simplest code, it works on jsfiddle but on Drupal7, well, nothing.
the file with the script is loaded, jQuery itself too.

(function (jQuery) {
function anichange (objName) {
 if ( jQuery(objName).css('display') == 'none' ) {
 jQuery(objName).animate({height: 'show'}, 400);
 } else {
 jQuery(objName).animate({height: 'hide'}, 200);
 }
}
}) (jQuery);

<li><a href="#u" onclick="anichange('#vipad'); return false">Нажми</a></li>
      <div id="vipad">
        <h2>Контакты</h2>

Answer 1

Because the anichange function is in the scope of the anonymous function and is not accessible outside. This won't work on jsfiddle either.