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<script type="text/javascript">
function uniqueArr(arr)
{
    arr = arr || [];
    var a = {};
    for (var i=0; i<arr.length; i++)
    {
        var v = arr[i];
        if (typeof(a[v]) == 'undefined')
        {
            a[v] = 1;
        }
    }
    arr.length = 0;
    for (var i in a )
    {
        arr[arr.length] = i;
    }
   
    return arr;
}
var ss=new Array();
ss.push("aaaa");
ss.push("bbbb");
ss.push("bbb1b");
ss.push("bbb2b");
if (ss.length == uniqueArr(ss).length){
   alert("no reapeat"); 
}
else{
 alert("reapeat!!!"); 
}
//alert(ss.length);
//alert(uniqueArr(ss).length);
</script>


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