JS tail server logs

tail.js

var jq = document.createElement('script');
jq.src = "http://code.jquery.com/jquery-latest.min.js";
document.getElementsByTagName('head')[0].appendChild(jq);
function tail(){
	$.get(window.location.href+'?'+new Date().getTime(),function(data){
		var $newPre = $('<pre></pre>'); 
		var logArray = data.split('\n');
		var lineCount = logArray.length;
		$newPre.append('Line count='+lineCount+'\n');
		var tail = "";
		var tailSize = 50;
		for(var i=(lineCount-tailSize);i<lineCount;i++){
			tail = tail + (logArray[i]+'\n');
		}
		$newPre.append(tail);
		$('pre').remove();
		$('body').append($newPre);
	});
}
var id = setInterval(tail,1000);
console.log(id);