function openPopup (imageURL, caption) {
var windowTop = 100; // Top position of popup
var windowLeft = 100 // Left position of popup
var defaultWidth = 730; // Default width (for browsers that cannot resize)
var defaultHeight = 532; // Default height (for browsers that cannot resize)
var onLoseFocusExit = true; // Set if window to exit when it loses focus
var undefined;
// Set up the window open options
var Options = "width=" + defaultWidth + ",height=" + defaultHeight + ",top=" + windowTop + ",left=" + windowLeft + ",resizable"
// Now write the HTML markup to the new window, ensuring that we insert the
// parameter URL of the image and the parameter description of the image in
// the right place.
var myScript = "\n" +
"\n" +
"\n" +
"" + caption + "\\n" +
"\n" +
"\n" +
"\n\n" + "\n" +
"![\""](\"" "\\"\"")
\n" +
"\n" + "\n";
// Create the popup window
var imageWindow = window.open ("","imageWin",Options);
imageWindow.document.write (myScript)
imageWindow.document.close ();
if (window.focus) imageWindow.focus();
}