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What's wrong with this?



In the following code, the statement

    iz = str.length - lit.length;

*seems* to set "iz" to 0, rather than the correct value, which is 47 (65 - 18).
Alert #1 displays the values 0, 65, 18 for iz, str.length, and lit.length,
respectively.  

What am I doing wrong?

Using NS 2.0b5 on PowerMac, Sys 7.5.1.


Bill
===========================
  var whattext;
  function displayPrecis(which) {

    var str       = "" + top.frames["aux1"].location,
        lit       = "precis-callee.html";
    var iz;
    iz = str.length - lit.length; 
#1  alert("Here : " + (" " + iz) + " " + str.length + " " +  lit.length);
#2  alert("<" + str.substring(iz, str.length) + ">" ); 
    return true;
  }