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function InitiateAjaxRequest(url, callBack)    {      var http = getHTTPObject(); // Create the HTTP Object          http.onreadystatechange = function()      {        if ((http.readyState == 4) && (http.status == 200))          callBack(http.responseText);      };        http.open("GET", url, true);      http.send(null);    }    

So now, all I have to do on the page is...

function onSomeUIEvent()    {      InitiateAjaxRequest("someBusinuessPage.aspx?CustID=42", onRecvdCustDetails);    }         function onRecvdCustDetails(responseText)    {      // do something with reponseText  }    

Suh-weet.