function sameChanged() {
    if (xmlhttp.readyState==4) {
      
      var aresp = new Array();
      
      aresp = xmlhttp.responseText.split('\n');
      same_table = document.getElementById('same_result');

      clearResult();
      for (samename in aresp){
        same_table.innerHTML += aresp[samename];
      }
    }
  }

  function clearResult(){
  
    same_table = document.getElementById('same_result');

    if (same_table){
      rowc =  same_table.childNodes.length-1;
      for (i = rowc; i >= 0; i-- ){
        same_table.removeChild(same_table.childNodes[i]);
      }
    }
  }

  function showsame(user_id) {
    xmlhttp=GetXmlHttpObject();
    if (xmlhttp==null) {
      alert ("Your browser does not support XMLHTTP!");
      return;
    }
    var purl="same.php?user_id="+user_id;
    var url = ''; 
    checked = false;
    a = new Array('month', 'doctor', 'hospital');
    for (s in a){
      cb = document.getElementById('same_'+a[s]);
      if (cb.checked){
        checked = true;
        url = url+'&'+escape("same["+a[s]+"]")+'='+cb.value;
      }
    }
    if (checked){
      url = purl+url;
      xmlhttp.onreadystatechange=sameChanged;
      xmlhttp.open("GET",url,true);
      xmlhttp.send(null);
    } else {
      clearResult();
    }
    return false;
  }