its a jokes and funny stuff web site , but yet you went with dark colors , maybe to give the atmosphere of comedy club ? it doesnt feel like that , if you want to stay with the dark colors ( i personally would bright the all thing up, and go with a white background ) so i will suggest to add more colors , its really not the right colors imo to a jokes web site, more like funeral house web site
you must do something with the header, i like the smoking smiley
but the fonts and the color does not combine well .
the adsense does not sit well at all, sometime the page get longer only because of the add, that's not good . the adds need to flow better with the site , i would go with 250X250 add below the content in the middle column , with no frame and make it to blend better in the site
bottom line , this site needs a lot of work , ( reminds me a lot of web sites from the late 90)
good luck
by the way ,
why not make
wordpress blog out of it ?
there is a lot of great themes that will be perfect for a joke site
and it will be much more easy for you to manage