Virtuemart increase number of related products
To increase the number of related products shown we need to edit the file - shop.product_details.php
How to change Virtuemart "Add to cart" button
Open components/com_virtuemart/themes/default/images folder and you can change the add to cart button to different colors (add-to-cart_color.gif). Or just replace it with your custom add to cart image button.
Disable HTML Filtering in Joomla
Joomla 1.5
You can fix this if you disable WYSIWYG editor in Global Configuration. To do that, go to Site > Global Configuration and for Default WYSIWYG Editor select "Editor - No Editor". Then get back to edit your article (or Custom HTML module) and try to re-enter your code and save again. HTML won't be cut off now.