function get_htmlpart( target ) {
	var http = new XMLHttpRequest();
	
	requestURL = 'topics.cgi';
	
	http.open('GET', requestURL, true);
	http.onreadystatechange = function() {
		handleHttpResponse(target,http);
	}
	http.send(null);
}

function handleHttpResponse(target,http) {
	if (http.readyState == 4  && http.status == 200) {
		change_htmlpart(target,http.responseText);
	}
}

function change_htmlpart(target,str) {
	var el = document.getElementById(target);
	el.innerHTML = str;
}