title: Magento quantity field doesn't work
body: <p>i simply can't find a solution to my problem!
  The quantity field worked as it should. After a few months of programming on the whole shop, i wanted to test the quantity field and recognized that it doesn't function.</p>
  
  <p>I only can add one product to the cart although i typed “3” in the quantity field.</p>
  
  <p>I didn’t change anything in product/view.phtml and addtocart.phtml.
  Don't know where i have to search for this error.
  Maybe someone can give me a tip...</p>
  
  <p>greets max</p>