function getSearchResults(keyword,sitebase) {
    var xmlHttp;
    try {
        // Firefox, Opera 8.0+, Safari
        xmlHttp=new XMLHttpRequest();
    }
    catch (e) {
        // Internet Explorer
        try {
            xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch (e) {
            try {
                xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch (e) {
                alert("Your browser does not support AJAX!");
                return false;
            }
        }
    }
    xmlHttp.onreadystatechange=function() {
        if(xmlHttp.readyState==4) {
            document.getElementById('contentCenter').innerHTML=xmlHttp.responseText;
        }
    }
    xmlHttp.open("GET",""+sitebase+"contentSearch.php?keyword="+keyword+"&random"+Math.random(),true);
    xmlHttp.send(null);
}