var eventWriter = document.getElementById("monthly");
var month;
function showMonth(month){
  var item1 ="<IFRAME name=\"framed\" src=\"" + month + ".htm\" width=\"540\" height=\"500\" scrolling=\"auto\" frameborder=\"0\"> ";
  var item2 ="[Your user agent does not support frames or is currently configured not to display frames. However, you may view";
  var item3 = "<A href=\""+ month + ".htm\">the related document.</A>]</IFRAME>"; 
  
  eventWriter.innerHTML = item1 + item2 + item3;
}