There isn't. You can download Dolphin Browser HD and download an add-on to take screenshots within the browser, but you can't take them outside the browser unless you root your phone. If you do root your phone I recommend drocap2
if you dont restart your phone a lot this is an option. Make sure you read the instructions, you have to connect it to your computer and run an app everytime you boot it up. I'm assuming it does something to simulate root or something like that.