How to copy all the attributes of one element and apply them to another?

Answer 1

A working solution on jsfiddle

EDIT

Updated jsfiddler

Javascript

$(function(){
    var destination = $('#adiv').eq(0);
    var source = $('#bdiv')[0];

    for (i = 0; i < source.attributes.length; i++)
    {
        var a = source.attributes[i];
        destination.attr(a.name, a.value);
    }
});

HTML

A class
B class

That's copying #bdiv attributes to #adiv.