var Months = new Array("January","February","March","April","May","June","July","August","September","October","November","December");
  
  function modInfo(tagId){
    modDate = new Date(document.lastModified);
    
    x = document.getElementsByTagName("meta");
    for (var i=0;i<x.length;i++){
      if (x[i].getAttribute("name")=="author"){
        var author = x[i].getAttribute("content");
        break;
      }
    }
    document.getElementById(tagId).innerHTML   = "Last Modified: " + 
                                                  modDate.getDate() + " " + 
                                                  Months[modDate.getMonth()] + " " + 
                                                  modDate.getFullYear();
    if (author){
      document.getElementById(tagId).innerHTML+= " by " + author;
    }
  }