function ajax_request( t, url ) {
	var tar = $(t);
	new Ajax.Request(url,
		{
			method:'get',
			onSuccess: function(transport){
				tar.update(transport.responseText);
			}
		}
	); 
}
function ajax_html_request( url ) {
	var oReq = new ActiveXObject('Microsoft.XMLHTTP');
	oReq.open('GET', url, false);
	oReq.send()
	if (oReq.statusText == 'OK') {
		return oReq.responseText;
	} else {
		return false;
	}
	
	return;
}
function ajax_json_request( url ) {
	var json = ajax_html_request( url );
	var obj = eval('('+ json +')');
	return obj;
}