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Help with script function....

Help with script function....

Help with script function....

I have here some code that is supposed to add or remove a key value from the screen.  the adding part is working but if the value exists I want them to remove the cosen value.  here is the code:

function tableSelect(service)
    var myform;
  myform = document.itemform;
  myform.target = "_top";
  var tableFirstIndex = myform.stranList.value.indexOf(service);

  var tbIndex1 = svList.indexOf(service);
  var modtable = service + ","
  var tablesIndex = strans.indexOf(modtable);
  if(tableFirstIndex > -1)
     if(confirm("Remove Transaction: " + service + "?"))
       var var1 = myform.stranList.value.substring(0, tableFirstIndex);
       var var2 = myform.stranList.value.substring(tableFirstIndex + service.length + 2, myform.stranList.value.length);
       var var3 = svList.substring(0, tbIndex1);
       var var4 = svList.substring(tbIndex1 + service.length + 1, svList.length);

       var var5 = strans.substring(0, tablesIndex);
       var var6 = strans.substring(tablesIndex + modtable.length , strans.length);

       var newList = var1 + var2;
       lblist = var3 + var4;
       strans = var5 + var6;
      SetCookie("strans", strans);
      SetCookie("svList", svList);
       myform.stranList.value = newList;
  svList = svList + service + "\n";
  strans = strans + modtable;

  SetCookie("strans", strans);
  SetCookie("svList", svList);
  myform.stranList.value = myform.stranList.value + service + "\n";

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