Hi
Goto Template Manager — JA Univeristy – Default — Options Tab — LAYOUTS tab — Select the layout are you using Default or Default Home
edit it
<blocks name="top" style="xhtml">
<block name="absolute" type="modules" style="raw">absolute</block>
<block name="top-panel" type="modules" style="raw" main-inner="1">top-panel</block>
<block name="header" type="header" main-inner="1"></block>
<block name="mainnav" type="mainnav" main-inner="1"></block>
<block name="cpanel" type="usertools/cpanel"></block>
remove this block <block name=”header” type=”header” main-inner=”1″></block>
Save your Layout