function common(url,x,y) {
	mywin = window.open(url,"win",'toolbar=0,location=0,directories=0,status=1,menubar=0,scrollbars=1,resizable=1,width=' + x + ',height=' + y + ',top=' + ((screen.height - y)/2) + ',left=' + ((screen.width - x)/2) + '');
}