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<script>
$(document).ready(function() {
var stickyNavTop = $('#navmain').offset().top;
 
var stickyNav = function(){
var scrollTop = $(window).scrollTop();
      
if (scrollTop > stickyNavTop) { 
    $('#navmain').addClass('fixed-nav');
} else {
    $('#navmain').removeClass('fixed-nav'); 
}
};
 
stickyNav();
 
$(window).scroll(function() {
    stickyNav();
});
});
</script>