function crossBrowserCSS(param) {
 var OSName="Unknown OS";
  if (navigator.appVersion.indexOf("Win")!=-1) OSName="Windows";
  if (navigator.appVersion.indexOf("Mac")!=-1) OSName="MacOS";
  //choose the right stylesheet for the user's resolution 

  if (navigator.appVersion.indexOf("Mac")!=-1) {
    if (param=='main') {
      document.write("<link href='styles.css' rel='stylesheet' type='text/css' media='screen' />");
    } else {
      document.write("<link href='styles.css' rel='stylesheet' type='text/css' media='screen' />");
    }
  } else {
    if (param=='main') {
document.write("<link href='styles.css' rel='stylesheet' type='text/css' media='screen' />");

    } else {
document.write("<link href='styles.css' rel='stylesheet' type='text/css' media='screen' />");
    }
  }
}