Javaxcript question for Dreamweaver

Hi,

Can anyone help me with the following javascript? (Full code at the end of 
this email)

      exportData=exportData.substring(0,exportData.length-1)+lineBreak;

I'm trying to write something in front of the string but cannot.  I can write 
after the string:
      exportData=exportData.substring(0,exportData.length-1)+"HELLO 
WORLD"+lineBreak;

How can I write in front????
TIA
Peter.

======FULL CODE======
//function: exportTable
//description: called from Export button
//exports tabular table based on html table

function exportTable(){
   var exportData = "";
   var theForm = document.forms[0];
   var currTable = findTable();
   var lineBreak = getLineBreak(theForm);
   var delimiter = getDelimiter(theForm);
   
   var tableRows = currTable.childNodes;
   var nRows = tableRows.length;
   var i,j;
   var tableCells;
   var nCells;
   var currRow;
   
   for (i=0;i<nRows;i++){
      if (tableRows.item(i).tagName!="TR")
         continue;
      currRow = tableRows.item(i);
      tableCells = currRow.childNodes;
      nCells = tableCells.length;
      for (j=0;j<nCells;j++){
         exportData+=addQualifiers(  getTextNode(tableCells.item(j)), 
delimiter);
         exportData+=delimiter;
      }
      
exportData=exportData.substring(0,exportData.length-1)+"\'\);"+lineBreak;
   }
   writeToFile(exportData);
}
========END OF CODE========

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