This is not what I want to do.
I want to show only one web page (in a frame) at the time.
According to the choice made at the left side menu, another web page with only the essentilal data will be displayed at the same place without the need to load a complete webpage again.
Suppose a menuj with the buttons "Home", "Contact Us", "About us", etc...
In a normal situation, each button will load the according webpage "Home.html", "Contact.html", "About.html", etc.
I would like to have 1 main webpage with a open space or a frame and load/display the different webpages in the main page according to the choice made.
Something like is done with graphics and the command "onmouseover", "onmouseout", etc...