Alert Script for Blogger,when anybody will visit your website or blog he will get an welcome message before loading your page completely.You can have anything in the message what you want.It can be helpful for you whenever you want to display to your welcoming visitor some message or alert which you can be important for him to get to your blog reading further.
Just login to blogger > Layout > Edit Html
Find <head> tag and add the below script just after it.
Just change text in red with your welcoming message.
And now save your template.And visit your blog you will get an welcome message.