function calendar_popup(url){
var popw = (screen.width - 349) / 2; 
var poph = (screen.height - 285) / 2; 
var popft = 'width=349,height=285,top='+poph+',left='+popw+',scrollbars=no,menubar=no,resizable=no';
var name=window.open(url, "pop",popft);
name.focus();
}
function printer_friendly(url){
var popw = (screen.width - 650) / 2; 
var poph = (screen.height - 600) / 2; 
var popft = 'width=650,height=600,top='+poph+',left='+popw+',scrollbars=yes,menubar=no,resizable=no';
var name=window.open(url, "pop",popft);
name.focus();
}