The net with HP 1910

I have just got my first ipaq and love it. I am exploring what it can do and when i link up to my pc/broadband connection to see how it performs with ie I find that it doesn't allow for many pages to open. For instance, I open Yahoo, then get the mail link signed in, but it won't let me view my email. Other sites don't open past the initial webpage. Is this a restriction of a handheld or something else?