Different sites in a single web page

Question

hai 2 all

i need to show some web sites in div

for example

in a web page on left side there are 2 options say like

yahoo and the other is gmail

now when ever i click on yahoo..on the left side  i needed to show that yahoo site on the right side of that web page....in the same way when ever i click on gmail..i needed to show gmail site on right  side..is it possible to show like that..if yes means ...plz help me out