function post(action, params, callback){
	if( typeof action == 'undefined' ){
		return false;
	}
	$.post('ajax/caller.php?a=1&action=' + action, params, function(data){
		data = eval('(' + data + ')');
		if( data.error == true ){

		} else {
			callback.call(this, data);
		}
	});
}