How do i make the screen larger for web games?

I don't want the default resolution to be 320x240,how can i increase the web resolution to something larger such as 1600x1200,obvously not that large,but this is something i'd like to know. thanks for any help.

You need to modify the html file which you're using - it has 2 (or 3, i forget) places to modify it for different browser modes

Documentation is here:

If you want to change the default html code unity spits out for the size of the embedded web game, you can edit that in project settings->player->default web screen width/height.