how reassign links on object elements to pdfs in SS2

I have  20 dgns which I have at several polygons or shapes which have had links ( over 40 per DGN  ) to pdfs on  HD  X:\ customfolder 1\folder 2\folder 3\

and our  IT depart wants to move all these  from X:\ customfolder 1\folder 2\folder 3\ 

to      Z:\ folder 21\folder 23\ same folder 3 name as before\ in other words another drive and change in folder structure too...

how can we reassign the pdf links .. I dont want to do it by hand  there must be a macro around or mdl or a betterway....

And next year they may change it again and this time to MS share point so I think they will be url's addresses....

I'm going to cross post in programming too...