How can I add an element after another element?

Question

try using the after() method:

$('#bla').after('<div id="space"></div>');

Documentation

try

.insertAfter()

here

$(content).insertAfter('#bla');

First of all, input element shouldn't have a closing tag (from http://www.w3.org/TR/html401/interact/forms.html#edef-INPUT : End tag: forbidden ).

Second thing, you need the after(), not append() function.