Why would that make a difference?
It is likely a missing return false
Here is the canonical method
<a href="facultypage.html" target="_blank" onClick="return open_faculty_win(this.href,this.target)">Pop</a>
function open_faculty_win(loc,target){
stats='width=600,height=600,resizable,toolbar=no,location=no,directories=no,status,menubar=no,scrollbars';
var w = window.open (loc,target,stats)
return w?false:true
}
If you must focus, add the focus to the page you open instead