function send_contact_form(){
  $('#sendContact').attr('disabled', true);
  var name = document.getElementById('yourName').value;
  var email = document.getElementById('yourEmail').value;
  var subject = document.getElementById('subject').value;
  var message = document.getElementById('message').value;


  var link = 'contact_go.php';
  var params = 'name=' + name + '&email=' + email + '&subject=' + subject + '&message=' + message;

      var httpObject = getXmlHTTPObject();
      if(httpObject != null)
	{
	  httpObject.open("POST", link, true);
	  httpObject.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	  httpObject.setRequestHeader("Content-length", params.length);
	  
	  httpObject.onreadystatechange = function(){
	    if(httpObject.readyState == 4 )
	      {
		response = httpObject.responseText;
		if(response == 'true')
		  {
		    popup("<p> Thank you for contacting us.  We will respond promptly to your message.</p>");
		    $('#sendContact').attr('disabled', false);
		  }
		else
		  popup(response);
	      }
	  }
	  httpObject.send(params);
	}

}