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javascript 控制frameset左邊顯示與隱藏

<frameset cols="180,16,*" id=pageframe>
			<frame noresize name="menu" scrolling="yes" src="${pageContext.request.contextPath}/home_left.action">
			<frame noresize name="frameline" scrolling="yes" src="${pageContext.request.contextPath}/home_frameline.action">
			<frame noresize name="right" scrolling="yes" src="${pageContext.request.contextPath}/home_right.action">
		</frameset>
<%@ page language="java" pageEncoding="UTF-8"%>
<%@ page trimDirectiveWhitespaces="true" %>
<html>
	<head>
	<title>frameline</title>
	<%@ include file="/WEB-INF/jsp/public/commons.jspf"%>
	<style type="text/css">
	body{
	background-color: #BFDDF1;
	}
     .panel-tool {
position: absolute;
top: 50%;
margin-top: -8px;
height: 16px;
overflow: hidden;
}
     .panel-tool a {
display: inline-block;
width: 12px;
height: 16px;
opacity: 0.6;
filter: alpha(opacity=60);
margin: 0 0 0 2px;
vertical-align: top;
}
.layout-button-left {
background: url('style/images2/layout_arrows.png') no-repeat 0 0;
}
	</style>
	<script type="text/javascript">
function ShowHideLeft(objtd){
if (parent.pageframe.cols=="180,16,*"){
   parent.pageframe.cols="0,16,*";
   document.getElementById("frameLine").style.background=" url('style/images2/layout_arrows.png') no-repeat 0 -16px";
}
else{
   parent.pageframe.cols="180,16,*";
   document.getElementById("frameLine").style.background=" url('style/images2/layout_arrows.png') no-repeat 0 0px";
}
}
</script>
</head>
<body>
<div class="panel-tool">
<a id="frameLine" href="javascript:void(0)" onClick="ShowHideLeft(this);" 
class="layout-button-left "></a>
</div>
</body>
</html>