i'm desgining my web site
i want to set id for per files
for example : news=show&id=256
and link to these file

please help me

hm, you're getting it wrong
you have to make a php page, for example index.php

and then in that file, you type for example
if (isset(news) && news==show){
if (id==1){
include("pagex.html");
}
if (id==2)
...


if (id==256){
include ("pagey.html");

}

something like this.
you could replace the huuuuuge amount of 'if's' by using a table in a mysql database that says which id refers to which url.
and then do something like
mysql_query("select name from pages where id=".*_GET['id']);

and then you have the name of the page. all you have to do now is import it.