If I defined variables in my ZPT using tal:define, how do I pass these variables to a javascript function without getting an error?

My attempt (obviously wrong):
      <td tal:define="itemId item/id; code item/code">
      <a style="color:dodgerblue"
         tal:define="url string:${request/URL1}/processDeleteItem?itemId:int=$itemId&code=$code"
         href="javascript:doNothing()" onClick="javascript:confirmDelete('string:$code', 'string:$url')"><img src="/ItemManager/images/delete_icon" border="0"></a>
      </td>
     

Thanks,

Karen