var cssNode = document.createElement('link');
cssNode.href = '/resources/styles/menu.css';
if (navigator.userAgent.indexOf("Firefox") > 0)
   cssNode.href = '/resources/styles/menuFirefox.css';
else{
   if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)){ //test for MSIE x.x;
 		var ieversion=new Number(RegExp.$1) // capture x.x portion and store as a number
 		if (ieversion>=8)
  			cssNode.href = '/resources/styles/menuIe8.css';
	}   
}
cssNode.type = 'text/css';
cssNode.rel = 'stylesheet';
document.getElementsByTagName("head")[0].appendChild(cssNode);