function openwin(url, name, w,h){
  l = (screen.width) ? (screen.width-w)/2 : 100;
  t = (screen.height) ? (screen.height-h)/2 : 100;
  win = window.open(url,name,'toolbar=no,location=no,directories=no,status=no,scrollbars=yes,resizable=yes,copyhistory=yes,width='+w+',height='+h+', left='+l+', top='+t+', dependent=yes');
}



function openwin_noscroll(url, name, w,h){
  l = (screen.width) ? (screen.width-w)/2 : 100;
  t = (screen.height) ? (screen.height-h)/2 : 100;
  win = window.open(url,name,'toolbar=no,location=no,directories=no,status=no,scrollbars=no,resizable=yes,copyhistory=yes,width='+w+',height='+h+', left='+l+', top='+t);
}


function changePage(page){
  document.getElementById('page').value = page;
  document.getElementById('form_page').submit();
}