One of the most interesting trick to make a webpage more interactive is the
so-called rollover effect commonly known from window system GUIs. The idea
is simply to change the underlaying image when the mouse rolls over it.
Additionally when a mouse click occurs over the image it acts like a button
and jumps to a new URL.
Although there are more then one way to achieve this optical effect, to use
solution. But here only those variants can be used which provide the image
object. Netscape version 3 and 4 and Internet Explorer 4 support this. But
the generated code of this <rollover> tag is backward-compatible
with all types of browsers.
This string is displayed in text-only browsers or browsers which have images
disabled at the place where the image stays. Additionally it is displayed in
the browsers status line when the mouse is over the image.