sorting troubles

parchman

Hi,
I am having difficulties sorting my numeric table. AS far as I know it should detect automatically how to sort. Even though all of my columns are numeric it does not do the job however. It should be able to handle html right? as all my values are in an <a> tag.
Here is a link to my table: http://glossa.uni-graz.at/archive/objects/query:srbas.accounts/methods/sdef:Query/get?params=$1|%3Chttp://gams.uni-graz.at/rem/%23bs_StadtEinnahmen%3E&mode=

Thanks for your help!
Chris