var user=navigator.userAgent
var app=navigator.appName

var win='<img src="http://www.orca194.org/images\/windows_mail.png" width="150" height="23" alt="Windows" style="vertical-align:middle;border:0"\/>';
var mac='<img src="http://www.orca194.org/images\/apple_mail.png" alt="Mac" width="150" height="23" style="vertical-align:middle;border:0"\/>';
var other='<img src="http://www.orca194.org/images\/other_mail.png" alt="Other" width="150" height="23" style="vertical-align:middle;border:0"\/>';


if ((user.indexOf("Firefox")!=-1) && (user.indexOf("Windows")!=-1))
  {
  document.write(win);
  }
else if ((user.indexOf("Firefox")!=-1) && (user.indexOf("Mac")!=-1))
  {
  document.write(mac);
  }
  
else if (user.indexOf("Safari")!=-1)
  {
  document.write(mac);
  }
else if (app.indexOf("Explorer")!=-1)
  {
  document.write(win);
  }
else
  {
  document.write(other);
  }