opening flattened Pdf

Hi -

I have PDF 1.4 that started out in LifeCycle and as was flattened (using itext).  I would like to open the PDF at a particular page location.  I know the javascript to do this is something like xfa.host.currentPage = 4 but don't know how to do it dynamically by passing in an argument from an HTML page for example.  Any help would be appreciated.

Thanks, Doug