Popup javascript codes are mostly used for cpa or cpm ads . By this webmaster try to attract visitors towars their products and hopes for good results . You must have seen that many website owners use different popup windows with different presentation styles but if you want to create your own code then you can try many online tools .

Fg-a.com provides you an online tool by which you can easily make a javascript that will popup and optionally center a popup window for you . To generate your advertiser or any promotional javascript you have to fill small form provided by them and then click on make code button . After clicking on make code button you can see your javascript code in below given boxes . Just copy that code and you can use it in your any webpage . You can check above image for example .

Remember :- Copy generated code and paste it in notepad first because it is divided into two parts and you have to paste it in different sections .