var osName = navigator.appVersion ;
var browser = navigator.appName ;
var winIEstylesheet = "/css/style_winIE.css" ;
var winNNstylesheet = "/css/style_winNN.css" ;
var macstylesheet = "/css/style_mac.css" ;
if(osName.indexOf('Mac')!=-1){
		document.write( "<link rel=\"stylesheet\" href=\"" + macstylesheet +  "\" type=\"text/css\">" );
}
else if(osName.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\">" );
	}
}