Try this:
<HTML>
<HEAD>
<TITLE>Using Buttons</TITLE>
</HEAD>
<BODY>
<H1>Using Buttons</H1>
<FORM NAME="form1" ACTION="default.jsp" METHOD="POST">
<INPUT TYPE="HIDDEN" NAME="buttonName">
<INPUT TYPE="BUTTON" VALUE="Button 1" ONCLICK="button1()">
<INPUT TYPE="BUTTON" VALUE="Button 2" ONCLICK="button2()">
</FORM>
<SCRIPT LANGUAGE="JavaScript">
<!--
function button1()
{
document.form1.ACTION = "option1.jsp"
form1.submit()
}
function button2()
{
document.form1.ACTION = "option2.jsp"
form1.submit()
}
</SCRIPT>
</BODY>
</HTML>