function pencere(ad, url, pencere_ad, gen, yuk){
window.name = ad;
var prop = 'toolbar=no,';
	prop+= 'location=no,';
	prop+= 'directories=no,';
	prop+= 'status=no,';
	prop+= 'menubar=no,';
	prop+= 'scrollbars=no,';
	prop+= 'resizable=no,';
	prop+= 'copyhistory=no,';
	prop+= 'width=';
	prop+= gen;
	prop+= ',height=';
	prop+= yuk;
	prop+= 	',left=';
	prop+= ((screen.width/2) - (gen/2));
	prop+= ',top=';
	prop+= ((screen.height/2) - (yuk/2));
window.open(url,pencere_ad,prop);
return false;
}