why this simple javascript doesnt work on friefox and chrome?
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                user1647406
            
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        Published on 2012-09-04T21:33:48Z
        Indexed on 
            2012/09/04
            21:37 UTC
        
        
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why this simple code i have written wont work on fire fon and chrome but it works carefully on IE ? whats wrong whit this javascript code ? i just want to find a way too get selected checkbox text ( or label) and use it by $_post on another page . sorry for my bad english .
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<script type="text/javascript" language="javascript">
function ReadCheckbox()
{
    var temp = '';
    var radio;
    var popupTag ;
    for (var i=1 ; i<5 ; i++) {
        radio = document.getElementById('chk'+i);
        if(radio.checked == true){temp += radio.value}
    }
      document.getElementById('aaaa').value = temp;
}
</script>
</head>
<body>
<label>What is your Site Address ?</label><br/>
<label>NetNic.ir</label><input id="chk1" type="checkbox" value="NetNic.ir" />
<label>SarirWeb.Com</label><input id="chk2" type="checkbox" value="SarirWeb.Com"/>
<label>LearnCD.ir</label><input id="chk3" type="checkbox" value="LearnCD.ir"/> 
<label>AnimLand.ir</label><input id="chk4" type="checkbox" value="AnimLand.ir"/> 
<br />
<br/>
<textarea rows="2" name="aaaa" cols="20"></textarea>
<input type="button" onclick="ReadCheckbox()" value="???" style="height:32px; width:83px;"/>
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