function popup(url, w, h, s, r, c) {
	if(!w) w = 687;
	if(!h) h = 680;
	if(s != '0') s = 1;
	if(r != '0') r = 0;
	if(c) {
		l = (screen.availWidth - w)/2;
		t = ((screen.availHeight - h)/2);
	}
	w = window.open(url, 'popup', 'toolbars=0, scrollbars='+s+', location=0, statusbars=0, '  + ((c)?'top='+t+', left='+l+', ':'') + 'menubars=0, resizable='+r+', width='+w+', height='+h);
	w.focus();
}
function hide(obj) {
	obj.childNodes[0].style.visibility = 'hidden';
}
function show(obj) {
	obj.childNodes[0].style.visibility = 'visible';
}