drag and drop

gistfile1.js

var cancel = function(e) {
    e.stopPropagation();
    e.preventDefault();
    return false;
};
var drop = function(e) {
    cancel(e);
    add(event.dataTransfer.files);
    event.dataTransfer.clearData();
    return false;
};

document.addEventListener('dragover', cancel, false);
document.addEventListener('drop', drop, false);

document.removeEventListener('dragover', cancel);
document.removeEventListener('drop', drop);