window.dyn_css_rule = function(sSelector, sCssText) {
    try {
        var oCss = document.styleSheets[0];
        if (oCss.insertRule) {
            oCss.insertRule(sSelector + " {" + sCssText + "}", oCss.cssRules.length);
        } else if (oCss.addRule) {
            oCss.addRule(sSelector, sCssText);
        }
        return sSelector + "{" + sCssText + "}";
    } catch(err) {
        
    }
};