How to give a POPUP with Yes/NO based on certain value in picklist and then direct it to New record

  Hi,My req. is quite simple but difficult for me to implement in CRM using Javascript.

In the Opty detail page, Custom object 6 has been exposed in the related information section.

Also there is a picklist field in Opty Detail Page with values 'Confirm' and 'Reject'.

All I want is when i user selects on Confirm, a popup should appear with 'message and YES and NO option'. If user clicks NO he should remain on the same page, but if the user clicks YES he should be taken to the same page just like when he would have clicked on the New button in the related information section for Custom Object 6...i.e page for new record for CO6.