// JS:

function searchData()
{
var suchfeld = document.getElementById("suchfeld").value;
frames['mac'].location.href="content.jsp?suche="+suchfeld;
}

// Textbox
<textbox id="suchfeld" width="150"  flex="1" type="autocomplete">

// Button
<button label="Suche" id="searchbutton" oncommand="searchData();" />

// Iframe
<iframe flex="9" name="mac" src="test.jsp" frameborder="0" />