extract a number within an xml file

Shell Programming and Scripting
4

Ok I just ran into another snag, In some cases when there are multiple hits for a given tv show:

<Data>

<Series>
<seriesid>77847</seriesid>
<language>en</language>
<SeriesName>MacGyver</SeriesName>
<banner>graphical/706-g2.jpg</banner>

<Overview>
blah blah blah
</Overview>
<FirstAired>1985-09-29</FirstAired>
<zap2it_id>SH002714</zap2it_id>
<id>77847</id>
</Series>

<Series>
<seriesid>83158</seriesid>
<language>en</language>
<SeriesName>Young MacGyver</SeriesName>

<Overview>
blah blah blah
</Overview>
<IMDB_ID>tt0352117</IMDB_ID>
<id>83158</id>
</Series>
</Data>

Is there a way to make it compare the name in <SeriesName></SeriesName> to a variable i provide and only capture the seriesID for the match?

Thanks