Providing a link in the task notification mail

Hi Experts,

I need to provide a link in the Task notification mail so that when the user clicks on this link then the task directly opens through portal not thro web Dispatcher.

By default the Task notification mail consist of 2 Links.

1) The link which opens the task directly and is a web dispatcher link (This I need to replace with a custom link)

2) The link which opens the User UWL where user can search that task and open that task,

My requirement is to replace the Web dispatcher link with the portal Task link(i.e. this is the link which comes up when user search for this task from UWL and clicks on it .)

Any pointer to acheive this functionlity will be helpfull.

Regards,

Anand