firefox add new row problem

Add new row fails in firefox. works in ie 6.
in firefox when i click on "add row"  it doesnt do anything.

pl help

here is the code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
function addRow() {

      var x=document.getElementById('t1').insertRow();
      var col1=x.insertCell(0);
      var col2=x.insertCell(1);

  <TABLE id="t1">
  <INPUT TYPE="button" value="add row" onclick="addRow()">
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HonorGodSoftware EngineerCommented:
You might want to take a look at:

HonorGodSoftware EngineerCommented:
You need to specify the row # of the row to be added/inserted...
For example:

var x = document.getElementById( 't1' ).insertRow( 2 );

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vidhubalaAuthor Commented:
works cool.. thanks.
HonorGodSoftware EngineerCommented:
You are very welcome.
Thanks for the grade & points.
Good luck
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