function nav_back(page) {
  var num, start, end;
     
  // get the number of the page and decrement 1
  
  start = 12; // "/questions/q" 
  end = page.indexOf(".");  // stop at the .
   
  num = page.substring(start,end);
  
  if (num > 0) {
    num = num - 1;
  }
  
  document.location.href = "/questions/q" + num + ".asp";
  //document.location.href = history.back();
}

function showPage(which,w,h) {
 var sParm
 sParm = 'width=' + w + ',height=' + h + ',resizable=yes,locationbar=no,menubar=no,statusbar=no,scrollbars=no,personalbar=no,toolbar=no';
//alert("Which: " + which);
 window.open(which,'',sParm);
}