function PopupPage(pageName, pop_wdt, pop_hgt) { 
  if (document.all) {
    var x = window.screenLeft;
    var y = window.screenTop;
    var w = window.document.body.offsetWidth;
    var h = window.document.body.offsetHeight;
  }else{
    var x = window.screenX;
    var y = window.screenY;
    var w = window.outerWidth;
    var h = window.outerHeight;
  }
    var pop_wdt2 = 0;
    var pop_hgt2 = 0;
    var pop_offset_x = 2*0;
    var pop_offset_y = 2*0;
    var pop_wdt2 = pop_wdt + pop_offset_x;
    var pop_hgt2 = pop_hgt + pop_offset_y;
    var cntx = x + Math.round((w - pop_wdt2) / 2);
    var cnty = y + Math.round((h - pop_hgt2) / 2);
    myWindow = window.open(pageName,'page','left='+ cntx +',screenX='+ cntx +',top='+ cnty +',screenY='+ cnty +',width=' + pop_wdt2 +',height=' + pop_hgt2 +',toolbar=0, location=0,directories=0,status=0,menuBar=0,scrollBars=1,resizable=0'); 
    myWindow.focus();
} 
//<a href="javascript:PopupPage('coccaro.htm',450,335);">