Detecting File->print Click

My css stylesheet distinguishes between media print and screen. I'd like my javascript to do the same as I have a collapsable address book. To wit: For the screen my javascript is:

<!--
window.onload=addressbook;
function addressbook(id) {
var d = document.getElementById(id);
for (var i = 1; i<=15 ; i++) {
if (document.getElementById('saddressbook'+i)) {
document.getElementById('saddressbook'+i).style.display='none'
} }
if (d) {d.style.display='block'}
}
// -->
For the print, I would want all displays. That is:

<!--
function printaddressbook() {
var d = document.getElementById(id);
for (var i = 1; i<=15 ; i++) {
if (document.getElementById('saddressbook'+i)) {
document.getElementById('saddressbook'+i).style.display='block'
} } }
// -->

Is there a way that I can have the javascript detect a CTRL-P or a click on the browser's File->Print to fire this printaddressbook function, or do I have to create a "print-view" button?