POPUPS

A pop-up window (English pop-up) - a form of advertising on the Internet, aimed at increasing traffic to the advertiser's site. Some web sites open to display advertising a new browser window (hence the name). Advertising pop-ups are usually created using JavaScript, although there may other ways. 
Some pop-up windows open in the background (English pop-under). They are less distracting the user, but they are not visible until the active window is closed. Thus, the user becomes more complicated to determine which web site opened a pop-up window.
Advertising pop-ups outside the browser 
Pop-up window can display not only browsers, and other programs. Some of them are the same people run for this one or another browser. So come, many spyware programs as well as programs supported by advertising, although the boundary between the first and the second is not always obvious. 
Another type of pop-ups may be sent through the service of sending messages (Messenger Service) in the operating system Microsoft Windows. Despite the similar name, it should not be confused with the instant messaging client Windows Messenger or Windows Live Messenger. These pop-ups appear as a dialog box with a text message usually contains a link to a website. Service sending messages has been disabled for the second service pack (Service Pack 2) for Windows XP. 
Pop-up Blocker 
Opera was the first popular browser, which contained the possibility of blocking popups. Subsequently, Mozilla has improved the original approach by blocking only pop-up windows that open when the page is loaded. In early 2000-ies. all major browsers except Internet Explorer, allows the user to almost completely block the unwanted pop-ups. In 2004, Microsoft released Windows XP SP2, which added such capabilities in Internet Explorer. 
Most modern browsers include the possibility of blocking popups. Third-party developers started to develop in other directions, in particular filtration of advertisements. 
Securing the desired pop-ups 
In some cases, pop-ups are desirable and can cause incorrect blocking any problems. 
Many web sites use pop-up windows to display information without changing the current page. For example, when filling out web forms with the necessary explanations can be caused by using a pop-up window. 
Some companies, such as McAfee, use the pop-up windows to install the software from the web sites. 
Bypass blocking pop-ups Advertisers continually seek ways to circumvent the restrictions. For example, some pop-ups are created using Adobe Flash. Since only the windows are blocked due to JavaScript, using Flash allows obhitrit blocker. 
Some sites use a combination of banner advertising and pop-up window (en: hover ad), which uses DHTML, to go forward. Using JavaScript advertisements can be implemented in neotobrazhaemuyu part of a web page, and then shows where the author so wishes. For example, advertisements may contain Flash-animations, which refers to the advertiser's site. Or the advertising may seem like a normal window. Because the ads in this case is part of a Web page, used to block modified stylesheets or third-party ad blocker, such as Adblock. DHTML-advertising can significantly burden the processor, especially in the case of old computers. 
Generators Popup Window 
Generator pop-up windows - a program for the development, storage, installation and support of advertising pop-ups. Some of these programs will generate only slightly blocked pop-ups, but others can be a complex software systems to develop multi-pop-ups and other types of advertising.

POPUPS