split function in Safari

Can somebody please help me with the following code snippet? It works in all the browsers except for Safari, and it's driving me nuts. Thanks so much.
function addFileListToSelect(listVal) {
  alert(listVal);            // shows "Tabor-2117.qdfm;" (as expected)
  
  var teststring = "ab-bc-cd";
  var testarray = teststring.split("-");
  alert(testarray[0] + "\n" + testarray[1] + "\n" + testarray[2]);
         // shows "ab\nbc\cd" (as expected)
 
  alert(listVal);            // shows "Tabor-2117.qdfm;" (as expected)
  var fileNameArray = listVal.split("-");
  alert(listVal);            // shows "Tabor-2117.qdfm;" (as expected)
  if(fileNameArray == null) alert("null");
                             // shows "null" (huh???!!!)        
}

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tjgquickenAsked:
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Göran AnderssonConnect With a Mentor Commented:
What are you sending into the function? If it's not a string, you might get unexpected results.

If you make sure that it's a string that you are using the split method on, does it change things?

var fileNameArray = String(listVal).split("-");
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tjgquickenAuthor Commented:
That was it. Thank you very much.
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