var pop = null;

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

function popup(id,w,h,r,s){
	var url='index.cfm?selNavId='+id;
	var args = 'width='+w+',height='+h+',resizable='+r+',scrollbars='+s+'';
	pop = window.open(url,'',args);
	return (pop) ? false : true;
}

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