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)
	}