dpending on the name value of the button
example...
<INPUT TYPE="submit" name="submit1">
<INPUT TYPE="submit" name="submit2">
then your php page that it jumpt to...
something like
<?PHP
if ($post_['submit1']){
print "submit 1 was clicked";
}
if ($post_['submit2']){
print "submit 1 was clicked";
}
else {
print "nothing";
}
?>