var ajax = false;
function create_ajax(){	
  if (window.XMLHttpRequest) {
    ajax = new XMLHttpRequest();
    if (ajax.overrideMimeType) {
      ajax.overrideMimeType('text/xml');
    }
  }
  else if (window.ActiveXObject) {
    try {
      ajax = new	ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (e) {
      try {
        ajax = new
        ActiveXObject("Microsoft.XMLHTTP");
      } catch (e) {}
    }
  }
	
  if (!ajax) {
    alert('Giving up :( Cannot create an XMLHTTP instance');
    return false;
  }
}

function send_ajax(param,e){	
  ajax.open('POST', "site/ajax/ajax.php", true);
  ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	
  ajax.onreadystatechange = function() {
    if (ajax.readyState == 4) {
      if (ajax.status == 200) {
        document.getElementById(e).innerHTML = ajax.responseText;
      }
    }
  }	
  ajax.send(param);	
}