addLoadEvent(checkForUnits);

function checkForUnits() {
    if(navigator.userAgent.toLowerCase().indexOf('msie') >= 0) { 
        //Run only if Internet Explorer b/c it does not support the
        //:before and :after pseudo-classes in css
        addBracketsToClassUnits();
    }
}

function addBracketsToClassUnits() {
    var spans = document.getElementsByTagName("span");
    for(var i = 0;i < spans.length;i++) {
        if(spans[i].className == 'Units') {
            spans[i].innerHTML = '['+ spans[i].innerHTML +']';
        }
    }
}