[support] change node name

Hi dear

am having the three content type, are page,story,event,

each content type holding the more then 50 contents,

that is story contents is 70, page contents is 80, event content is 80,

So what happen u see when ever i click the any content ,

Then the URL is looked like this manner "localhost/demo/node/20",

for page type ,and for story type and event type, for all type , the url is same like " Localhost/demo/node/* "

So my thing is,

I want to change the node to depends on the content type,

Like when user click page replated content , then URL must be like this manner "localhost/demo/page/20"

and for story "localhost/demo/story/75"

like this maner, i want to change the node ...

any ide afor this situation...

Thanks in advance