Focus On A Child Window In Opera?

I have a web page which lists and displays all the characters for which a Named Entity code exists, with coding details etc..Some of these characters are quite obscure and the reader will only be able to see them if they have a suitable Unicode font on their own PC/browser. If not, they will just see placeholder squares.

For these obscure characters, I've set up a popup window. Click on a placeholder square and a small window appears which shows a .gif of what the character should look like, and a label saying what it's called.If the user closes the window after viewing, there's no problem. The difficulty comes in if somebody wants to click on a succession of placeholders and view a succession of character .gifs, and meanwhile the initial child window has slipped to the back of the stack and is behind the webpage instead of in front.

In IE, Netscape and Safari, it's easy - I just use .focus to bring the child window to the fore. In Chrome, which doesn't recognise the .focus command, I close the child window and re-open it. [There's code further up the document which identifies the browser.]However, neither .focus nor closing and re-opening the window works with Opera, which turns the child window into a tab rather than a separate window, and then shoves that tab to the back.how I can get Opera to either move the focus to the child-tab on command, or close it on command so it can be re-opened?This is the code that generates the child window:

function charDisplayer()
{
if (isIEorInnerGroup == "Yes") {codeWidth = windowWidth*.171, codeHeight = windowWidth*.239, codeInset = windowWidth*.041} else[code]....

Ignore the line which begins if (isIEorInnerGroup == "Yes") - this is part of a setup which resizes all art, tables etc to maintain a constant size across all browsers and screen resolutions."stylesheet" is passed as a variable because I have two different stylesheets on the go, to accommodate the fact that Netscape handle text-size differently from the other browsers. There's a function elsewhere which sets the value of stylesheet according to whether the browser is Netscape or not, and whether the platform is a Mac or not."charID" is a variable which identifies the code name of the character (taken from the Named Entity code) and looks it up under that name in a list of .gifs. "charName" is a variable which passes a text-string saying what the character is called, e.g. "Not a subset of".There is an "isOpera" variable which can be used to start a specific action if the browser is Opera.