$(function() {
var show = false
var on_top_button = $('
')
$('body').append(on_top_button);
$('.on_top_panel', on_top_button).click(function(){
$.scrollTo( $('body') , 500, { axis: 'y' } );
})
$(window).scroll(function () {
show_or_hide()
})
function show_or_hide(){
if( window.pageYOffset > 400){
if(!show){
on_top_button.show()
show = true
}
}else{
if(show){
on_top_button.hide()
show = false
}
}
}
function mini_or_normal_width(){
if( $(window).width() < 1330 ){
on_top_button.addClass('mini')
}else{
on_top_button.removeClass('mini')
}
}
$(window).resize(function() {
mini_or_normal_width()
});
mini_or_normal_width()
show_or_hide()
});