function createStyleRule(selector, declaration) {
	if (!document.getElementsByTagName || !(document.createElement || document.createElementNS)) return;
	var agt = navigator.userAgent.toLowerCase();
	var is_ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
	var is_iewin = (is_ie && (agt.indexOf("win") != -1));
	var is_iemac = (is_ie && (agt.indexOf("mac") != -1));
	if (is_iemac) return; // script doesn't work properly in IE/Mac
	var head = document.getElementsByTagName("head")[0];
	var style = (typeof document.createElementNS != "undefined") ?  document.createElementNS("http://www.w3.org/1999/xhtml", "style") : document.createElement("style");
	if (!is_iewin) {
		var styleRule = document.createTextNode(selector + " {" + declaration + "}");

		style.appendChild(styleRule); // bugs in IE/Win
	}
	style.setAttribute("type", "text/css");
	style.setAttribute("media", "screen");
	head.appendChild(style);
	if (is_iewin && document.styleSheets && document.styleSheets.length > 0) {
		var lastStyle = document.styleSheets[document.styleSheets.length - 1];
		if (typeof lastStyle.addRule == "object") { // bugs in IE/Mac and Safari
			lastStyle.addRule(selector, declaration);
		}
	}
}