function createRpbRequestObject() {
    var ro;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        ro = new XMLHttpRequest();
    }
    return ro;
}

var rpbhttp = createRpbRequestObject();

function loadRpb(id, url)
{	
	document.getElementById('rnl-related').style.background = '#fff';
	document.getElementById('rnl-related').style.color = '#7192A5';
	document.getElementById('rnl-byuser').style.background = '#fff';
	document.getElementById('rnl-byuser').style.color = '#7192A5';
	document.getElementById('rnl-popular').style.background = '#fff';
	document.getElementById('rnl-popular').style.color = '#7192A5';
	
	if (id == 'r'){
		document.getElementById('rnl-related').style.background = '#9cc';
		document.getElementById('rnl-related').style.color = '#000';
	}
	else if (id == 'b'){
		document.getElementById('rnl-byuser').style.background = '#9cc';
		document.getElementById('rnl-byuser').style.color = '#000';
	}
	else{
		document.getElementById('rnl-popular').style.background = '#9cc';
		document.getElementById('rnl-popular').style.color = '#000';
	}
	
	rpbhttp.open('get', 'http://www.orbitspin.com/ajax/rpbView.php?'+url);
	rpbhttp.onreadystatechange = handleRpbResponse;
	rpbhttp.send(null);
}

function handleRpbResponse() {
  if(rpbhttp.readyState == 4) {
    var response = rpbhttp.responseText;
    document.getElementById('rpbText').innerHTML = response;
  }
}

function intRpb(cat) {
	rpbhttp.open('get', 'http://www.orbitspin.com/ajax/rpbView.php?fetch=related&cat='+cat);
	rpbhttp.onreadystatechange = handleRpbResponse;
	rpbhttp.send(null);
}