Change logo in 11.5.10.2

When you open Oracle Application,your first step would be to open the URL hostname.domainname:port . You will get the first screen .When this url opens below files will come into picture.
1>apptitle.html
2>applist.html
3>appdet.html
4>appsmed3.gif
Location of these files are:cd $COMMON_TOP/portal/(context_name)
You see the Oracle Application logo on the left hand side on this screen. How to change this logo and if you place your mouse pointer on this logo you will see [Oracle Application]. When you click on this loge, will take you to oracle.com How to change this logo and the respective links.
To do this we need to modify only two files appsmed3.gif and apptitle.html
Step 1> Replace appsmed3.gif with your logo
Step 2> Modify the following italic lines in apptitle.html href="xyz.oracle.com/applications/index.html"
target=_top.........appsmed3.gif" xyz...."[Oracle Applications]"
Dont'confuse xyz etc.... this site is not allowing me to write any html syntax
Step3>Bounce the apache and clear the cache and see the diffrence.

Reagrds
--Guru