var osName = navigator.appVersion ;
var browser = navigator.appName ;
var winIEstylesheet = "script/ie.css" ;
var winNNstylesheet = "script/nn.css" ;
var macstylesheet = "script/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\">");}
}