Opening consecutive new windows with window.open freezes IE

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Been having a problem with opening consecutive windows with window.open in
IE!

After several attempts at opening windows with java links, eventually now
only 5/6 times, the following opening attempt freezes showing just a blank
window with no apparent activity. Example - www.newgenerationwebsites.com
going to 'showcase' you can click on example sites and after just a handful,
the windows cease opening properly.

Do I have settings configured incorrectly or is the code faulty/missing
something in the java window open lines, ie stack reset, etc.

Using Firefox, this doesn't happen and works well!

Help, please!