Left Menu become to long!!

[nude2life]

hei, my customer using this sitebuilder as blog for few years and now the left menu sort by month of the years become very long!!
January, 2008
February, 2008
March, 2008
April, 2008
May, 2008
June, 2008
July, 2008
August, 2008
September, 2008
October, 2008
November, 2008
December, 2008
January, 2009
February, 2009
March, 2009
April, 2009
May, 2009
June, 2009
July, 2009
August, 2009
September, 2009
October, 2009
November, 2009
December, 2009
January, 2010
February, 2010


any idea how to solve this problem?

thanks.
Eric