calling LaunchPickerTreeDialogSelectUrl from different domain

Hi,

   I have 2 site in sharepoint let say siteA and siteB (with different domian name) and I have access in both site, now when I call the js methodLaunchPickerTreeDialogSelectUrl (fromPickerTreeDialog.js) from siteA passing the siteB as url parameter the callback function is not executing.does anyone have experience this kind of scenario?

Cheers