Name pollution
This is one of those nasty javascript quirks that nails me every 5 years or so. See if you can spot it. The first form has a bug in the code, the submit2 button produces an error and doesn't work.
Form1
<form name="f1" action="./"><p> <input type="submit" value="submit1" name="submit"><br/> <input type="button" value="submit2" name="submit2" onclick="javascript: document.f1.submit();" /> </p></form>
Form2
<form name="f2" action="./"><p> <input type='submit' value="submit1" name="submit1"><br/> <input type="button" value="submit1" name="submit2" onclick="javascript: document.f2.submit();" /> </p></form>