var httpRequest=false;

function handleResults(){
	if(httpRequest.readyState==4){
    		if(httpRequest.status==200){
			document.getElementById("comment").innerHTML=httpRequest.responseText;
		}else{
			alert('error : ' + httpRequest.responseText);
		}
	}
}

function requestComment(){
	if (window.XMLHttpRequest){ // if Mozilla, Safari etc
		httpRequest=new XMLHttpRequest()
		if (httpRequest.overrideMimeType)
			httpRequest.overrideMimeType('text/xml')
	}else if (window.ActiveXObject){ // if IE
		try{
			httpRequest=new ActiveXObject("Msxml2.XMLHTTP");
		} 
		catch (e){
			try{
				httpRequest=new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e){}
		}
	}
	return httpRequest;
}

function startComment(url,param){
	requestComment();
    	httpRequest.onreadystatechange = handleResults;
    	httpRequest.open('GET', url + param, true);
    	httpRequest.send(null);
}