Jquery implements the example of moving Div up and down

 
$(this).ready(function() { 
$(".up").each(function() { 
$(this).click(function() { 
var $tr = $(this).parents("li"); 
if ($tr.index() != 0) { 
$tr.prev().before($tr); 
} 
}); 
}); 
var trLength = $(".down").length; 
$(".down").each(function() { 
$(this).click(function() { 
var $tr = $(this).parents("li"); 
if ($tr.index() != trLength) { 
$tr.next().after($tr); 
} 
}); 
}); 
$("a[name='up']").click(function() { 
if ($("input[name='rule']:checked").size() > 1) { 
alert(" Only one item can be selected to move up and down! "); 
return; 
} 
$("input[name='rule']:checked").each(function() { 
var $div = $('#rule_' + $(this).val()); 
if ($div.index() != 0) { 
$div.prev().before($div); 
} 
}); 
}); 
$("a[name='down']").click(function() { 
if ($("input[name='rule']:checked").size() > 1) { 
alert(" Only one item can be selected to move up and down! "); 
return; 
} 
$("input[name='rule']:checked").each(function() { 
var $div = $('#rule_' + $(this).val()); 
if ($('#rule_' + (parseInt($(this).val()) + 1)).html() != null) { 
$div.next().after($div); 
} 
}); 
}); 
});