url rewriting automaticaly when i give the filename

I want soultion for following task sir.
in my project have following folder structure in solution Explorer
************
f:\ex
-App_Data
-Default.aspx
-webconfig
-bharani //folder
      -JScript1.js
      -HtmlPage.htm
-dharani//folder
       -JScript2.js
      -HtmlPage1.htm
   first i will run "Default.aspx" that time present page Url have "localhost:ex\Default.aspx" its normal one..that same window i will delete the "Default.aspx" and enter "Jscript1.js" like following format "localhost:ex\Jscript.js" it automaticaly redirect into his own page and automatically rewrite his Url Like"localhost:ex\bharani\Jscript.js" if it is possible or not,if have possible then give me a solution.
thank you sir.