function xpencere(adres) {
var X,Y,en,boy
en = 700;
boy = 500;
X = (screen.width  - en) / 2;
Y = (screen.height - boy) / 2;
var Xx = window.open( adres, "dosya", 'width='+en+',height='+boy+',top='+Y+',left='+X+',scrollbars=yes,menubar=no,toolbar=no');
if (window.focus) {Xx.focus()}
}