// JavaScript Document
function openWindow(width,height,name) {
x = (640 - width)/2, y = (480 - height)/2;

if (screen) {
y = (screen.availHeight - height)/2;
x = (screen.availWidth - width)/2;
}
if (screen.availWidth > 1800) {
x = ((screen.availWidth/2) - width)/2;
}

window.open(name,'guestbook','status='+0+',menubar='+0+',scrollbars='+1+',width='+width+',height='+height+',screenX='+x+',screenY='+y+',top='+y+',left='+x);

}