Cognos javascript to format color every numeric digits in page

<script>

window.onload=coloring();

function coloring()

{

    var spans = document.getElementsByTagName('span'),

    obj = {};

    var r = /[(]\d+[)]/;   /////////pattern will color every number of pattern: (1234)

    for (var i = 0, l = spans.length; i < l; i++) {

    obj[spans[i].id] = spans[i].textContent || spans[i].innerText;

        if (spans[i].innerText.match(r))    {

          alert( spans[i].innerText);

          spans[i].style.color="#FF0000";

        }

    }

}

</Script>