.a little help guys..

I have an index.php page which contains tags which when clicked opens up picture.php.
.my picture.php is a page that retrieves images from a certain database depending on what is the idno.

.what i want to do is to add an "idno" attribute on my anchor tag that when the user clicks a certain tag the index.php sends the idno to my picture.php so that the picture.php knows what image to fetch from the database. help pls!