function insrow() {

  var rows=document.getElementById('fmenu').getElementsByTagName('tr');
  var count=rows.length;
  var key=count;
  var count=count-1;

  var row=document.getElementById('fmenu').insertRow();
  var a=row.insertCell(0);
  var b=row.insertCell(1);
  var c=row.insertCell(2);
  a.innerHTML="<b>Menu Item #"+key+"</b>";
  b.innerHTML="<input type=\"text\" name=\"nav"+count+"title\" />";
  c.innerHTML="<input type=\"text\" name=\"nav"+count+"filename\" />";
}