Ask any e-marketer and they’ll likely tell you it is high time deck the web’s walls with scores of sales, coupons, promotions, and special offers to entice holiday shoppers. But will the deals you have in mind match what consumers are seeking? What’s the best way to get shoppers’ attention online? And how do you know when the timing is exactly right to launch a particular campaign or promo? Experts say these are crucial questions to address in the days leading up to Black Friday and Cyber Monday.