<input type=button name="buttonone" onclick="func1()">
<input type=button name="buttonTwo" onclick="func2()">function func1(){
document.forms[0].action=?
document.forms[0].submit();
}function func2(){
document.forms[0].action=?
document.forms[0].submit();
}
<input type=button name="buttonTwo" onclick="func2()">function func1(){
document.forms[0].action=?
document.forms[0].submit();
}function func2(){
document.forms[0].action=?
document.forms[0].submit();
}
<input type="button" value="action1" onclick="form1.action='1';form1.submit();">
<input type="button" value="action2" onclick="form1.action='2';form1.submit();">
</form>