function slide() {
  // variables declaration
  var i,k;
  var msg;
 
  // init msg
  msg = initmsg;

  // increase msg
  k= (300/msg.length)+1;
  for (i=0; i<k; i++) msg+="  "+msg;

  //show it to window
  document.alertform.slide.value=msg.substring(position,position+200);

  //set new position
  if(position++==100) position=0;

  // repeat at entered speed
  id=setTimeout("slide()",200) ;
}