Passing URL in src attribute

Hello all ,
I have a static html page : decide.html"
which I invoke by the URL :

http://localhost:8080/happy/decide.html

OR

http://localhost:8080/sad/decide.html

In this static page ( decide.html ) I want to make a call to a servlet .

Here I am making use of code similar to this in decide.html :

Now my control is transferred to the servlet and I can execute code

However the problem is : How do I pass the URL in the src attribute to the servlet

I would like to dynamically pass either :
http://localhost:8080/happy/decide.html
OR
http://localhost:8080/sad/decide.html

based on which I would like the servlet to behave differently

Any help is appreciated
Thanks ,
-satish

Aside from the fact,that since they are different pages you can call 2 different servlets, you can add a parameter to your src url.
something like

You can get that currentUrl thing using javascript (at this case you need to use document.write to write script statement), or use JSP/Servlet API and don't forget to encode the url.
Than in a servlet you use request.getParameter("url") to get the value