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<iframe id='updateframe' src='kpi.php'>
</iframe>
The target of the form needs to refer to the name of the iframe ('updateframe' I presume), so it looks like you should move your name attribute from your form to your iframe. But you also need to specify an action for the form, otherwise it will default to itself (which I guess is not your kpi.php file?)...
<form action="kpi.php" method="get" target="updateframe">
:
</form><iframe id="updateframe" name="updateframe" src="kpi.php">
:
</iframe>
Just to note... the name attribute of the form is generally not required these days with modern scripts and importantly is deprecated in XHTML. (W3C XHTML1.0 - The elements with 'id' and 'name' attributes [w3.org])