It's not a joking. There are 514 bugs with Inoutscripts Shopping Cart Codes

1.  Line 25, Column 37: required attribute “type” not specified
   The attribute given above is required for an element that you’ve used, but you have omitted it. For instance, in most HTML and XHTML document types the “type” attribute is required on the “script” element and the “alt” attribute is required for the “img” element.

   Typical values for type are type="text/css" for 
2. Analysis of Inout Scripts Shopping Cart Codes
3. Explanation of 514 bugs at Inoutscripts Shopping Cart Codes