function disable_right_click(e){
  var browser=navigator.appName.substring(0,9);
  var event_number=0;
  if(browser=="Microsoft") event_number=event.button;
  else if (browser=="Netscape") event_number=e.which;
  if(event_number==2 || event_number==3){
    alert("Right Mouse Button Is Disabled"); return (false);}
  return (true);
}
function check_mousekey(){
  var mouse_key=93;
  var keycode=event.keyCode;
  if(keycode==mouse_key) alert("Mouse Key Is Disabled");
}
// Prevents user from viewing source code
function trap_page_mouse_key_events(){
//  var browser=navigator.appName.substring(0,9);
//  document.onmousedown=disable_right_click;
//  if(browser=="Microsoft") document.onkeydown=check_mousekey;
//  else if(browser=="Netscape") document.captureEvents(Event.MOUSEDOWN);
}
function chk_email(em){
  // My interpretation of a legitimate email address
  if(em.match(/^[A-Za-z0-9]+[\w\.-]*@[A-Za-z0-9]+([\.-][A-Za-z0-9]+)*\.[A-Za-z0-9]{2,4}$/i))
    return true;
  else
    return false; 
}
function changeBtn(what, theImage) {
   document[what].src = theImage;
}