strOrig = document.FullName;
strPath = document.Path;
strBase = fBaseName(document.FullName);
strExte = fNameExt(document.FullName);
strDate = fCurrDateTime(); 
strNewName = strPath + "\\" +  strBase + "_" + strDate + "." + strExte;
//alert(strNewName);
document.Save(strNewName);
editor.OpenFile( strOrig );


function fBaseName(str)
{
   var base = new String(str).substring(str.lastIndexOf('\\') + 1); 
    if(base.lastIndexOf(".") != -1)       
       base = base.substring(0, base.lastIndexOf("."));
   return base;
}

function fNameExt(str)
{
   var exten = new String(str).substring(str.lastIndexOf('\\') + 1); 
    if(exten.lastIndexOf(".") != -1)       
       exten = exten.substring(exten.lastIndexOf(".")+1);
   return exten;
}


function fCurrDateTime()
{
  var currentDate = new Date();
  var day = currentDate.getDate();
  if (day < 10) day = "0" + day;
  var month = currentDate.getMonth();
  if (month < 10) month = "0" + month;
  var year = currentDate.getFullYear();
  vDate = year + "," + month + "," + day;

  var currentTime = new Date();
  var hours = currentTime.getHours();
  var minutes = currentTime.getMinutes();
  if (minutes < 10)  minutes = "0" + minutes;
  vTime = hours + "," + minutes;
  return vDate + "-" + vTime;
}