var pop = null; function popdown() { if (pop && !pop.closed) pop.close(); } function youtube(youtube_id){ // popup standart oben links // pop=window.open('leer.html','youtube','resizable,scrollbars=0,width=450,height=375,Youtube,left=0,top=0'); // popup standart oben links // popup in der Mitte var h = Math.floor(((screen.availHeight)-400)/2); var w = Math.floor(((screen.availWidth)-1150)/2); pop=window.open('leer.html','youtube','resizable,scrollbars=0,width=450,height=375,left='+w+',top='+h); // popup in der Mitte pop.document.open(); pop.document.write('

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