how to modify logout functionality in joomla

[arupcse]

I am currently developing a site in joomla.in joomla there is a module named mod_login.php(module/mod_login.php). in this module there is a logout option.it works nicely but if i browse the different links and then i logged out(not in home page url), then it logged out but in the address bar the last visiting url exists.but i want that when i shall log out,it will take me to the home page url not the last visiting url. how can i modify module/mod_login.php or any other change to do this.