I have solved this by using "renderTwoPanes" jca tag:
<jca:renderTwoPanes orientation="horizontal"
headerPane="/netmarkets/jsp/some.jsp"
headerPaneHeight="30"
leftPane="/netmarkets/jsp/some2.jsp"
leftPaneSize="30"
rightPane="/netmarkets/jsp/some3.jsp"
rightPaneSize="70"
/>