[BioC] plotting BED intervals to TSS regions

[Seb]

hi gurus

i have several BED files containing chromosome #, start and end that
correspond to overlapping regions of different ChIP Seq experiments.
this part was done with Galaxy.

i also have a file containing TSS coordinates +/- 10kb.

what i want to do is to create a plot to show how many of my
overlapping intervals fall within the TSS regions, and, if they do,
have on the X axis the distance to the TSS and on the Y axis the
number of regions that overlap that certain part of the TSS

...i am a bit confused about how to do this tho...i looked in galaxy
and google but i didn't find a clear answer!

thanks