javascript action and submit form

[harivallabhshukla]

i have given following code in javascript .Here k and m are javascript variable
document.forms[formname].action="gotopage.php?parameter1="+k+"&parameter2="+m;
document.forms[formname].submit();

above code execute correctly when my html form has method POST.Below is my html page
<form name="formname" action=# method=POST>
<input type=text name="data1" value="one">
<input type=text name="data1" value="two">
<input type=button name="button1" value="send" onclick="javascritfunction();">
</form>

BUT when i give method GET in html form then html form data is submit i.e
gotopage.php?data1=one&data2=two is submitting not javascript action value i.e
gotopage.php?parameter1="+k+"&parameter2="+m

so how to submit form with javascript parameter when method is GET in html form