Used in scrollable blocks : blank space added in the body

[theredled]

Hi,

When you add a simpleAjaxUploader in a scrollable block (ex : scrollable table with uploads on each row), inputs are added in the body in absolute position.

But that position doesn't take into account the fact you're in a scrollable block, which causes adding element to the body, wrongly placed and much lower that the actual end of the content.

That leads to a potentially huge useless scrollbar on the window, and other bugs.