var iCount = 0; // Set to 1 if there is already a span by default.

function addChoice()
{
    if(iCount >= 10)
    {
        return;
    }

    new Insertion.After('choice', '<span style="display: block; padding-bottom: 5px"><label for="poll_choice">Option</label><input name="poll_choice[]" type="text" size="25" /></span>');
    iCount++;
}