ignores nofollow on button - adds items to cart

bot is adding items to cart even though the button is specified with nofollow

code sample (before jqueryui transforms it):
```
<button id="tdb2" type="submit"  rel="nofollow" >Προσθήκη Στο Καλάθι</button>
```

this type of button can be found on cart systems that use jqueryui for their button skinning (ie. oscommerce)