var pop = null;

function popdown() {
  if (pop && !pop.closed) pop.close();
}

window.onunload = popdown;
window.onfocus = popdown;

function popup(obj,title,x,y) {
  var url = (obj.getAttribute) ? obj.getAttribute('href') : obj.href; 
  if (!url) return true;
  x= (x) ? x : 300;		// 300x300 is the default
  y = (y) ? y  : 300;
  popdown();
  pop = window.open(url,title,'width=' + x + ',height=' + y + ',top=10,left=10,scrollbars=yes,resizable=yes');
  pop.focus();
  return (pop) ? false : true;
}

function popupEasy(url,name,x,y){
	popup_win = window.open (url,name,'width=' + x + ',height=' + y + ',top=10,left=10,scrollbars=no,resizable=yes');
	popup_win.focus();
}

function popupEasyScroll(url,name,x,y){
	popup_win = window.open (url,name,'width=' + x + ',height=' + y + ',top=10,left=10,scrollbars=yes,resizable=yes,status=yes');
	popup_win.focus();
}