Automator Log Into Internet

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Well my school internet requires that I log into it every time I turn on my Mac. To do this I have to open my browser (I use safari or chrome) and navigate to Google. During the loading of the page a small text box pops up from the top of my browser asking for my username and password. Here is where I put in my school username and password. Then I click OK (or whatever it is). Now, how do I get Automator to do that for me in one click?

I'm relatively new to Mac and have some idea of how Automator works.

All help is appreciated.

Thanks