problem with internet websites on my psp 1000?

why when i am on internet on my psp 1000 and i try to bring up a website i get an error message "there is not enough memory. close a tab or go to< < view settings> and set to ....." i thought the psp 1000 was supposed to handle the internet websites fine? what can i do to fix this and view all websites? thanks. meziggy@gmail.com