function toPage(p){
  showLoadingDiv('result_box');
  var url = './setfilter.php';
  var dt = new Date();
  var pars = 'dt='+dt.getHours()+dt.getMinutes()+dt.getSeconds();

  filter_value=$F('filter_value');

  pars=pars + '&filter_value=' + filter_value;
  pars=pars + '&beginpageno=' + p;
  pars=pars + '&perpage=' + perpage;
  
  var myAjax = new Ajax.Request(
                    url,
                    {method: 'get', parameters: pars, onComplete: toPage_onComplete, onFailure: toPage_reportError}
                    );
  return true;
}

function toPage_onComplete(request){
  $('result_box').innerHTML=request.responseText;
}
function toPage_reportError(request){
  alert('Sorry. There was an error. ');
}