.buttonAdd
{
    background: transparent url('/Images/shared/buttons/button_add_sprite.png') no-repeat 0 0;
    display: inline-block;
    height: 16px;
    width: 16px;
    vertical-align: middle;
}
.buttonAdd:hover,
.iconSprite:hover .buttonAdd,
.buttonAddDynamic
{
    background-position: -17px 0px;
    cursor: pointer;
}