Illustrator Scripting :: Alert Message Need To Be Added?

I need  to add alert message of number of unlock items in the following script.
 
#target illustrator
var myDoc = app.activeDocument;
var myPageItems = myDoc.pageItems;
var count = myPageItems.length;
for ( var i = count-1; i >= 0; i-- ) {if ( ! myPageItems[i].locked){ myPageItems[i].selected = true; }
{myPageItems[i].locked = false;{ myPageItems[i].selected = true;}}};
 
this script unlock the items, but i need the information of lock items.