function midfenster(winname,breite,hoehe) {
 var isq=screen.width/2-breite/2;
 var ariba=screen.height/2-hoehe/2;
pan1=window.open(winname, "titel", "width="+breite+",height="+hoehe+",top="+ariba+",left="+isq);
 pan1.focus();
}

function bigfenster(winname) {
 var pantalla_x=screen.width;
 var pantalla_y=screen.height;
 var ariba=0;
 var isq=0;
 pan2=window.open(winname, "titel", "width="+pantalla_x+",height="+pantalla_y+",top="+ariba+",left="+isq);
 pan2.focus();
}

function FullScreen(theURL) {
 window.open(theURL, '', 'fullscreen=yes, resizable=no, status=yes, scrollbars=no');}