var  avila = '/avila.shtml?idboletin=865';
var  burgos = '/burgos.shtml?idboletin=866';
var  leon = '/leon.shtml?idboletin=867';
var  palencia = '/palencia.shtml?idboletin=868';
var  salamanca = '/salamanca.shtml?idboletin=869';
var  segovia = '/segovia.shtml?idboletin=870';
var  soria  = '/soria.shtml?idboletin=871'; 
var  valladolid = '/valladolid.shtml?idboletin=872';
var  zamora = '/zamora.shtml?idboletin=864';


function busca_centro(laq) {
  if (laq=='') {
       alert ('Escriba una cadena de búsqueda');
       return false;
  }

  var url='/cgi-bin/apsesp/villalar/centros/buscar.php?q='+laq;
  var req = new XMLHttpRequest();
  req.open('GET', url);
  req.send(null);
  req.onreadystatechange = function() {
  if (req.readyState == 4 && req.status == 200 && req.responseText!="") {
        var texto = req.responseText;
	var d1 = document.getElementById('central');
        d1.innerHTML = texto;
      }
   }
 return false; 
}

function argItemsreferrer (theArgName) {
   var  b = document.location;
   var a = new String(b);
   var srch = a.substr(a.indexOf('?')+1);
   partOf = srch.split("&");
   // split param and value into individual pieces
   for (var i=0; i<partOf.length; i++) {
       var tmp = partOf[i].split("=");
                         mas = new RegExp('\\+','g');
                         if (tmp[0] == theArgName) return unescape(tmp[1].replace(mas,' '));
   }
   return '';
}