function Avaa(kohde){
  var win;
  win = window.open(kohde, "", "resizable=yes,alwaysRaised=yes,toolbar=no,Location=no,Menubar=no,scrollbars=yes,width=750,height=550"); 
 set_size(win, 600,500);

 }

function set_size(win,w,h) {
        win.resizeTo(w,h);
        win.moveTo((window.screen.width/2)-(w/2),(window.screen.height/2)-(h/2));
    }