function openDemo() {
	var w = 740;
	var h = 450;
	var mypage = "demo.html";
	var winl = (screen.width-w)/2;
	var wint = (screen.height-h)/2;
	if (winl < 0) winl = 0;
	if (wint < 0) wint = 0;
	var settings = 'height='+h+',';
	settings += 'width='+w+',';
	settings += 'top=' + wint + ',';
	settings += 'left=' + winl + ',';
	settings += "resizable,scrollbars=0,status=0,toolbar=0";
	win = window.open(mypage,"demo",settings);
	win.focus();
}
function openSShot(imgName,w,h) {
	var w = w+30;
	var h = h+30;
	var mypage = "images/"+imgName;
	var winl = (screen.width-w)/2;
	var wint = (screen.height-h)/2;
	if (winl < 0) winl = 0;
	if (wint < 0) wint = 0;
	var settings = 'height='+h+',';
	settings += 'width='+w+',';
	settings += 'top=' + wint + ',';
	settings += 'left=' + winl + ',';
	settings += "resizable,scrollbars=0,status=0,toolbar=0";
	win = window.open(mypage,"screenshot",settings);
	win.focus();
}