function openPopup (pixId) {
var windowTop = 10;                // Top position of popup
var windowLeft = 100                // Left position of popup
var defaultWidth = 500;             // Default width (for browsers that cannot resize)
var defaultHeight = 500;            // Default height (for browsers that cannot resize)
var undefined;
// Set up the window open options
var Options = "width=" + defaultWidth + ",height=" + defaultHeight + ",top=" + windowTop + ",left=" + windowLeft + ",status=0,location=0,toolbar=0,resizable"
// If the window is required to close when it loses focus.
var imageWindow = window.open (("show.php?id="+pixId),"imageWin",Options);
imageWindow.document.close ();
return false;
}