function updatepage(result){
      document.getElementById('content_text').innerHTML = result;
    }

    function GetData(req) {
		document.getElementById('content_text').innerHTML = '<img src=\"./img/busy.gif\" class=\"busy\">';
      var xmlHttpReq = false;
      var self = this;
      // Mozilla/Safari
      if (window.XMLHttpRequest) {
        self.xmlHttpReq = new XMLHttpRequest();
      }
      // IE
      else if (window.ActiveXObject) {
        self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
      }
      self.xmlHttpReq.open('POST', './scripts/portfolio_data.php', true);
      self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
      self.xmlHttpReq.onreadystatechange = function() {
        if (self.xmlHttpReq.readyState == 4) {
          updatepage(self.xmlHttpReq.responseText);
        }
      }
      self.xmlHttpReq.send(req);
    }