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<html> 
<body> 
<input type="checkbox" id="myCheckBox" value="checkbox" checked> 
Indeterminate = true. 
<input type="button" value="Checkbox state" onClick="function1();"> 
<script language="JavaScript"> 
document.all.myCheckBox.indeterminate = true; 
function function1() { 
   var m = document.all.myCheckBox.indeterminate; 
   alert("Indeterminate: "+m);  
}  
</script> 
</body> 
</html> 
 
     
       
         
   
    
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