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<head>  
<script type="text/javascript" src="http://code.jquery.com/jquery-1.4.4.min.js"></script>  
<script type="text/javascript">  
function selectGroup(checkbox,obj) { 
$('input[name='+obj+']').attr('checked', $(checkbox).attr('checked')); 
}  
</script>  
</head>  
<body>  
<input type="checkbox" />选中GROUPA<br/>  
GROUPA:<br/> 
<input type="checkbox" name="grp1" />11<br/>  
<input type="checkbox" name="grp1" />22<br/>  
<input type="checkbox" name="grp1" />33<br/><br/>  
 
<input type="checkbox" />选中GROUPB<br/> 
GROUPB:<br/> 
<input type="checkbox" name="grp2" />44<br/>  
<input type="checkbox" name="grp2" />55<br/>  
<input type="checkbox" name="grp2" />66<br/>  
</body>  
</html> 
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