// JavaScript Document


var screen_height = screen.height;


if (screen_height <= 600) {
  document.writeln(' <style type="text/css">#mainNav { top:540px; }</style>');
}

else if (screen_height <= 900){
  document.writeln(' <style type="text/css">#mainNav { top:560px; }</style>');
}

else {
   document.writeln(' <style type="text/css">#mainNav { top:660px; }</style>');

}