How to solve javascript issues

Some users reported JavaScript errors, ranging from thumbnails not loading to slide shows that do not start.
Most of the time, the problem is in one of the theme templates.

Lazyest Gallery loads their JavaScript libraries in the footer of your blog. This is a common practice to speed up loading of your blog in the visitor's browser. However, some themes lack the necessary functions in the footer for WordPress to insert the JavaScript.
If you are experiencing problems like:

• thumbnails do not load but show a spinning image
• slide show does not start but show loading continuously
• recent image widget is empty
• AJAX refreshing does not work, the page gets refreshed

please check the file footer.php and see if <?php wp_footer(); ?> is in the code. A theme should always have wp_footer() just before the closing </body> tag, or you will break many plugins, which generally use this hook to reference JavaScript files.
If you can't find this tag, please insert it and save your file. This should solve the above mentioned problems.