function showUsers() {

document.getElementById('loadimg').src = 'images/loading.gif';

var querystring = '';

for(i=0; i<document.searchfilters.elements.length; i++) {

   if(document.searchfilters.elements[i].type == 'checkbox' || document.searchfilters.elements[i].type == 'radio') {
      if(document.searchfilters.elements[i].checked === true) {
         querystring += document.searchfilters.elements[i].name + "=" + document.searchfilters.elements[i].value + "&";
         }
      }
      else if(document.searchfilters.elements[i].type == 'text' || document.searchfilters.elements[i].type == 'select-one') {
         if(document.searchfilters.elements[i].value !== '' && document.searchfilters.elements[i].value !== null) {
            querystring += document.searchfilters.elements[i].name + "=" + (document.searchfilters.elements[i].value) + "&";
            }
      }
      
}

if(window.XMLHttpRequest) {
   xmlhttp=new XMLHttpRequest();
   }
   else {
      xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }



xmlhttp.onreadystatechange=function() {
   if (xmlhttp.readyState==4 && xmlhttp.status==200) {
      document.getElementById('txtHint').innerHTML=xmlhttp.responseText;
      document.getElementById('loadimg').src = 'images/loading_off.gif';
      }
   }


xmlhttp.open("GET","usersearch.php?" + querystring,true);
xmlhttp.send();
}





function compareUsers() {

var user1 = document.comparison.user1.value;
var user2 = document.comparison.user2.value;

document.getElementById('loadimg').src = 'images/loading.gif';

if(window.XMLHttpRequest) {
   xmlhttp=new XMLHttpRequest();
   }
   else {
      xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }



xmlhttp.onreadystatechange=function() {
   if (xmlhttp.readyState==4 && xmlhttp.status==200) {
      document.getElementById('txtHint').innerHTML=xmlhttp.responseText;
      document.getElementById('loadimg').src = 'images/loading_off.gif';
      }
   }


xmlhttp.open("GET","./compare_result.php?user1=" + user1 + '&user2=' + user2 ,true);
xmlhttp.send();
}



function validatePPW() {
    if (document.regform.password.value != '') {
        document.getElementById('ppwerr').style.display = 'none';
        document.regform.sendreg.disabled = false;
        }
    else {
        document.getElementById('ppwerr').style.display = 'block';
        document.regform.sendreg.disabled = true;
        }

}

function getFocus() {
     document.getElementById('focus').focus();
}