How to pass parameter in YUI function

I want to pass parameter with javascript YUI function.

view.php

//Function Call

 $PAGE->requires->js_init_call('M.block_competency.init');

module.js

// JavaScript Document

M.block_competency = {};

M.block_competency.init = function(Y) {

var action = Y.one('#id_d_id');
action.on('change', function() {
var b=action.get('value');
window.location='view.php?viewpage=8&d_id=9';
});
};

How to send and recieve value in above function?