var xmlhttp=false;

if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
  xmlhttp = new XMLHttpRequest();
}


function moreTweets(beat,user) {
	var start = document.getElementById('start');
	start.value = parseInt(start.value) + 20;
	
	if(beat == 0){
		var extra = "";
	}else{
		var extra = "&beat="+beat;
	}
	
	if(user == 0){
		var extra2 = "";
	}else{
		var extra2 = "&user="+user;
	}
	
	xmlhttp.open("GET", 'ajax/more_tweets.php?start=' + start.value + extra + extra2 );
	xmlhttp.onreadystatechange=function() {
		if (xmlhttp.readyState==4) {
			document.getElementById("tweetainer").innerHTML += xmlhttp.responseText;
		}
	}
	xmlhttp.send(null);
	
	return false;
}