back to last page visited

Can someone tell me how to create a link in an html page that takes you back to the last page visited? In other words it acts as a back button. I'm pretty sure this requires javascript.
Thanks...

<input type=button value="Back" onClick="history.go(-1)">

<input> fields need to be inside forms to be valid. If you just want a stand alone button then:

<button onclick="history.back()">BACK</button>

Thanks for the tips!