function setPreference(prefName, prefAction, prefValue)
{
	sampleRequest = {
		method: 'preferences.set',
		params: [prefAction, prefName, prefValue]
	};
 
	request = $H(sampleRequest).toJSON();
	new Ajax.Request('/json-request', {
		method: 'post',
		postBody: request,
		contentType: 'application/json',
		onComplete: setPreference_handler
	});
	
	return false;
}
	
function setPreference_handler(originalRequest, json) 
{
//	alert(originalRequest.responseText);
//	alert(originalRequest.responseText.indexOf("\"OK!\""));
}