var os_name = navigator.appVersion ;
var browser = navigator.appName ;
var winIEstylesheet = "css/win_ie.css" ;
var winNNstylesheet = "css/win_nn.css" ;
var macstylesheet = "css/mac_ie.css" ;

if(os_name.indexOf('Mac')!=-1){
	document.write("<link rel=\"stylesheet\" href=\"" + macstylesheet + "\" type=\"text/css\">");
}
else if(os_name.indexOf('Win')!=-1){
	if(browser.charAt(0)=="N"){
		document.write("<link rel=\"stylesheet\" href=\"" + winNNstylesheet + "\" type=\"text/css\">");
	}
	else if(browser.charAt(0)=="M"){
		document.write("<link rel=\"stylesheet\" href=\"" + winIEstylesheet + "\" type=\"text/css\">");
	}
}
else{
	document.write("<link rel=\"stylesheet\" href=\"" + macstylesheet + "\" type=\"text/css\">");
}