<zk>
	<window title="A" border="normal" width="800px" height="600px"
		sizable="true" mode="overlapped" top="100px" left="100px">
		<hlayout>
			<div width="400px" height="600px" style="backGround:red"></div>
			<div width="400px" height="600px"
				style="backGround:green">
				<iframe width="100%" height="100%" />
			</div>
		</hlayout>
	</window>
	<window title="B" border="normal" width="500px" height="300px"
		sizable="true" mode="overlapped" top="350px" left="150px">
		<hlayout>
			<div width="250px" height="300px" style="backGround:red"></div>
			<div width="250px" height="300px"
				style="backGround:green">
				<iframe width="100%" height="100%" />
			</div>
		</hlayout>
	</window>
</zk>