var new_element;
function toggle_buy_select(el)
{
    var thing = typeof(el) == 'object'
        ? el
        : document.getElementById(el);
    var new_element = document.createElement("INPUT");
    new_element.name = thing.name;
    new_element.type = 'TEXT';
    new_element.size = '3';
    if (thing.className) new_element.className = thing.className;
    thing.parentNode.replaceChild(new_element, thing);
    
    return new_element;
}