Javascript code checkbox validation


<SCRIPT type="text/javascript">
function checkCheckBoxes() {
    if (document.getElementById("checkbox_dog").checked == false &&	    
        document.getElementById("checkbox_cat").checked == false )	    
    {
        alert ('You did not choose any of the checkboxes yet.');
        return false;
    } else {
        return true;
    }
}
</SCRIPT>

<html>
<body>
<form onsubmit="return checkCheckBoxes();" action="">
    <input type="checkbox" id="checkbox_dog" value="Dog">Dog</p>
    <input type="checkbox" id="checkbox_cat" value="Cat">Cat</p>
    <input type="submit" value="Submit" />
</form>
</body>
</html>


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