Custom Error Placement Function

I'm trying to create a custom error placement function that displays the error twice, once below the element and once above the form. I have managed to get my custom function to display the error below the element by duplicating the function from clientside_validation however also showing the errors above the form as well is proving difficult. I believe that this is partly because insertBefore() just moves the element, instead of cloning it. I have had some luck by using clone() however when I do this the error isn't removed once validation passes. Any ideas on this?

I've created a gist of the closest I've got so far: Gist

Thanks in advance.