var navig = "aaa-safari.css"
if(navigator.userAgent.indexOf("Mac") != -1 && navigator.userAgent.indexOf("Netscape") != -1) {
	navig = "aaa-ns.css"
}
if(navigator.userAgent.indexOf("Mac") != -1 && navigator.userAgent.indexOf("MSIE") != -1) {
	navig = "aaa-ie.css"
}
var returnTxt = "<link rel='stylesheet' href='" + navig + "'>";
document.write(returnTxt)
document.close()