small php and ajax modifications

I need thwo changes in an online shop. I provide all necesary details so you can start with the work without delays. ---------------------------------------- Changes to be done: 1.) "Add to chart" button should dissappear when product variant is out of stock. (in category and detailed view) [login to view URL] When you change the size to 250ml then back to 100ml you will see that it allredy works, but it does not work when page is loaded.) This need to be fixed. 2.) Current behaviour: if one or more products in cart show $text = JText::sprintf('X_ITEMS_FOR_X',$qty,$this->loadTemplate()); This behavious should be changed (if 1 product show different text then with multiple products) if one product in cart show $text = JText::sprintf('X_ITEM_FOR_X',$qty,$this->loadTemplate()); if more then 1 product in cart show $text = JText::sprintf('X_ITEMS_FOR_X',$qty,$this->loadTemplate()); 3.) My support forum told me to replace some php code with the following code. I can not do this myself <?php $str = $product->order_product_price; $length = strlen(substr(strrchr($str, "."), 1)) - 1; $nb = pow(10,$length); $tax = $product->order_product_tax * $nb / $product->order_product_price * 100; $tax .= '%'; ?> ---------------------------------------- This changes should be done urgently. Please write the word "Hannes" into your offer so I know that you have read my post eniterly. Thank you!