Unblockable popup and popunder on page load

We need someone to create a generic unblockable cross-browser popup and popunder for us which works on page load. We will supply a generic image for the popup/under and a URL to link too, you will be required to supply a standard php page and all associated files so that we can integrate the solution as and where required. The popup/under will link to a URL which will either open in _blank or _self as needed/, they must be cross browser compatible and unblockable. $30 maximum spend available.