IE & Firefox problem

<script>
function pro() {
parent.frame2.location='pro.php'; 
parent.frame1.location='empty.php';
}

function n_forms() {
parent.frame2.location='n_forms.php'; 
parent.frame1.location='empty.php';
}

function viewingreport() {
parent.frame2.location='viewingreport.php'; 
parent.frame1.location='empty.php';
}

function manage() {
parent.frame2.location='manage.php'; 
parent.frame1.location='empty.php';
}

function change_password() {
parent.frame1.location='change_password.php'; 
//parent.frame1.location='empty.php';
}
</SCRIPT>

Code (markup):

website link is : http://mygenius.uuuq.com/index_div.php
both of login username and password is 222
then click on Forms.....
when i open this by IE, the left frame content all go down to bottom part...
and when i click one of the link in left frame, the right frame displayed as full page....
but all this is worked well in firefox...