Wi fi problem

Helo every1..
I m here with a problem..
And thatz with my wi fi
i m using a samsung Galaxy Sl(GT19003) phone...
Till yesterday , there was no problem..
Bt today when i tried to connect , it got connected..but when i tried to acces the net, then it gave me no page..It showd like " the page cannot be displayed"..
I m seeing the wi fi logo on the top....
Bt just the logo is there , and i can't acces the net..
Cud somebody help me in this??