How can I concatenate a variable of a JS within a php line?

Hi

I need to concatenate a js variable (js function) in a php line. I would like to pass the complete link via xml.

Here's the code

Function selectCodigo(){
      xmlview = '<?php echo '/views/purchases/viewQueries/pending_to_pay.xml.php'; ?>';
      code = document.getElementById('fiscalCo').value;
      code = xmlview+'?filtro='+code;
      alert(code);
      code = '<?php encode_path('\'code\'') ?>';  // here's the problem, I need to introduce the 'code' variable in my php function (encode_path) in order to get the full link.
      return code;            
  }
after that I call the js function in my php script

this is my php line where the name js
$SelectBoxFi='<select id="fiscalCo" class="SelectBox" name="fiscalCo" size="1" class="" ONCHANGE="refreshTree('.'mygrid12'.',\\selectCodigo()'.'\\);">';      

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