ajax request

/**
* Credit: http://www-128.ibm.com/developerworks/xml/library/x-ajaxxml3/index.html?ca=dnw-812
*/
var req = null;
function processReqChange() {
if (req.readyState == 4 && req.status == 200 ) {
var dobj = document.getElementById( 'htmlDiv' );
dobj.innerHTML = req.responseText;
}
}

function loadUrl( url ) {
if(window.XMLHttpRequest) {
try { req = new XMLHttpRequest();
} catch(e) { req = false; }
} else if(window.ActiveXObject) {
try { req = new ActiveXObject('Msxml2.XMLHTTP');
} catch(e) {
try { req = new ActiveXObject('Microsoft.XMLHTTP');
} catch(e) { req = false; }
} }
if(req) {
req.onreadystatechange = processReqChange;
req.open('GET', url, true);
req.send('');
}
}

var seachTimer = null;
function runSearch()
{
if ( seachTimer != null )
window.clearTimeout( seachTimer );
seachTimer = window.setTimeout( function watchSearch() {
var url = window.location.toString();
var searchUrl = 'antipat1_content.html?s='+searchText.value;
url = url.replace( /antipat1b_fixed.html/, searchUrl );
loadUrl( url );
seachTimer = null;
}, 1000 );
}