var osName = navigator.appVersion ;
var browser = navigator.appName ;

var winIEstylesheet = "../../css/style_winIE1.css" ;
var winNNstylesheet = "../../css/style_winNN1.css" ;
var macstylesheet = "../../css/style_mac1.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\">" );
}
}