Trigger onChange manually

[red_evolve]

Greetings. Please advise me on the following.
I have a select form element and have defined its onChange action.
I have another button, which when pressed opens up a new pop-up window. A value will be selected from this child window and the value will be passed back to the opener window to the select element I mentioned previously. Now the value in the select element has changed but the onchange action is not triggered. How can I trigger the onchange event manually ?
Please advise.

[tgreer]

Use a function. Set the onChange() handler to run this function.

Call the same function at the conclusion of your "popup" script.

[red_evolve]

Thanks for your suggestion. I've made it to run.
Thank you again.