$(document).ready(function() {
$('div.side-menu> div').hide(); 
$('div.side-menu> h3').click(function() {
var $nextDiv = $(this).next();
var $visibleSiblings = $nextDiv.siblings('div:visible');
if ($visibleSiblings.length ) {
$visibleSiblings.slideUp('fast', function() {
$nextDiv.slideToggle('fast');
});
} else {
$nextDiv.slideToggle('fast');
}
});
});