var xmlAds = "";
function getads() {
        var url = "http://flightline.highline.edu/exhibits/snippets/homepageads/randomexhibitad.php";
		try
		  {
		  // Firefox, Opera 8.0+, Safari
		  xmlAds=new XMLHttpRequest();
		  }
		catch (e)
		  {
		  // Internet Explorer
		  try
		    {
		    xmlAds=new ActiveXObject("Msxml2.XMLHTTP");
		    }
		  catch (e)
		    {
		    try
		      {
		      xmlAds=new ActiveXObject("Microsoft.XMLHTTP");
		      }
		    catch (e)
		      {
		      alert("Your browser does not support this feature (AJAX)!");
		      return false;
		      }
		    }
		  }
        
        xmlAds.onreadystatechange = processAds;
        xmlAds.open("GET", url, true);
        xmlAds.send("");
        setTimeout('getads()', 15*1000);
      }
       
      function processAds() {
        if (xmlAds.readyState == 4) {
          if (xmlAds.status == 200) {
            div = document.getElementById("exhibitAds");
            div.innerHTML = xmlAds.responseText;
          } else {
            alert("There was a problem retrieving the XML data:\n" + xmlAds.statusText);
          }
        }  
}