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<form id='theForm'>
<input type='text' name='picture-1'>
<input type='button' id='btnMore' value='+'>
</form>
js:
$('#btnMore').click(function() {
var form, fields, newField;
form = $("#theForm");
fields = form.find("input[name^='picture-']");
newField = $(fields[0]).clone();
newField.attr('name', 'picture-' + (fields.length + 1));
newField.insertAfter(fields.last());
});