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javascript add attribute to html dom elements

This javascript function hides all the labels in the document, that have a rel attribute:

<script type="text/javascript">
function hide_labels()
{   
    var arr = document.getElementsByTagName("label");
    var arr2 = [];
       
    for (i = 0; i < arr.length; i++) {
    if(arr[i].hasAttribute("rel"))
    arr2.push(arr[i]);    
    }
    //console.log(arr2);
   
    for (i = 0; i < arr2.length; i++) {
    arr2[i].setAttribute('style', 'display:none;');
    }
}
</script>
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