var pop = null; function popdown() { if (pop && !pop.closed) pop.close(); } function youtube(youtube_id){ var h = Math.floor(((screen.availHeight)-375)/2); var w = Math.floor(((screen.availWidth)-450)/2); pop=window.open('about:blank','youtube','resizable,scrollbars=0,status=no,width=440,height=365,left='+w+',top='+h); pop.document.open(); pop.document.write('

'); pop.document.close(); } window.onunload = popdown; window.onfocus = popdown;