I required sub menu as left menu. I am working from past week. but i am unable to find out.

i found one link same what i required but it is not working perfectly. Any ideas on this or any workouts about this...please......

check this site for i found resource to do this
i changed my code a lot but no use. and one more thing i am building site in weebly.

my site html and css code files here

the issue is when i click on left menu that menu is not showing as active. means that active menu should be bold. how can i achieve this i am not able to do...i tried a lot..i don't know any thing about css...