Hiding the Category Text in a List View with a Group By

I recently had a request of me to hide the 'Category:' text on a List View web part in a MOSS 2007 farm.  As I have now had this request a few times and each time have to go figure out how to do it again, I thought that meant it was time for a quick blog post!  I found the original source here.  It's a great write up, but there are a few enhancements mentioned in the comments that were never incorporated into the script code of the article.  So here is the code with the changes incorporated:

_spBodyOnLoadFunctionNames.push("HideHeaders");
function HideHeaders()
{
    var elements = getElementsByClassName(document, "td", "ms-gb");
    var elem;
    for(var i=0;i<elements.length;i++)
    {
        elem = elements[i];
        elem.childNodes[3].style.display = "none";
        elem.childNodes[4].nodeValue = elem.childNodes[4].nodeValue.replace(':', '');   }
        elements = getElementsByClassName(document, "td", "ms-gb2");
        for(var i=0;i<elements.length;i++)
        {
            elem = elements[i];
            elem.childNodes[3].style.display = "none";
            elem.removeChild(elem.childNodes[4]);
        }
        elements = getElementsByClassName(document, "tr", "ms-viewheadertr");
        for(var i=0;i<elements.length;i++)
        {
            elem = elements[i];
            elem.style.display = "none";
        }
    }
    /*
    Written by Jonathan Snook, http://www.snook.ca/jonathan
    Add-ons by Robert Nyman, http://www.robertnyman.com
    */
    function getElementsByClassName(oElm, strTagName, strClassName)
    {
        var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
        var arrReturnElements = new Array();
        strClassName = strClassName.replace(/-/g, "\-");
        var oRegExp = new RegExp("(^|\s)" + strClassName + "(\s|$)");
        var oElement;
        for(var i=0; i<arrElements.length; i++)
        {
            oElement = arrElements[i];
            if(oRegExp.test(oElement.className)){
            arrReturnElements.push(oElement);
        }
    }
    return (arrReturnElements)
}