How to Show a Message When Opening Blog

Have you ever seen a blog that when we open it we will be shown a mesage? What the function? Usually the function is request to comments from us. Maybe, all of you think how is this trick active? Is it hard? No, it is very simple, you just follow the steps below to activate

1. Log in to your blogger account
2. Go to Design>>>Page Elemets>>>Add Gadget
3. Copy and paste the code below

<script language='javascript'>alert("ABCDEFGHIJKLM");</script>

4. Save it, check by reload your blog