In SCRIPT within HEAD, add rules to target style sheet:
<SCRIPT LANGUAGE="JavaScript1.2"> if (is.nav5up) addRuleToStyleElement (styleSheetElement, ".hint", "background-color:yellow"); else if (is.nav4) document.classes.hint.all.color = "yellow"; else if (is.ie4up) document.styleSheets ["ietssxyz"].addRule (".hint", "background-color:yellow"); </SCRIPT>