function fullscreen(url) {
	var x = screen.availWidth;
	var y = screen.availHeight;
popup = window.open(url,'fullscreen','toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,width='+x+',height='+y+',left=0,top=0');
popup.resizeTo(x, y);
popup.moveTo(0, 0);
popup.focus();
}

mac=(navigator.appVersion.indexOf('Mac')!=-1)?true:false;
ie=(navigator.appName.charAt(0) == "M")?true:false;

function guestbook(url){
if(mac){
popup = window.open(url, "guestbook","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,copyhistory=0,width=350,height=480");
popup.moveTo(0, 0);
}
else{
popup = window.open(url, "guestbook","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,copyhistory=0,width=370,height=500");
popup.moveTo(0, 0);
}
}

function exhibition(url){
  window.open(url, "exhibiton","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,copyhistory=0,width=800,height=500");
}