For some days, I am trying to make a popup virtual keyboard for bengali characters for my forum amaderprojukti.com. The problem that I faced and waste so many hours is that it was working in firefox, opera, safari, netscape etc except in IE(Internet explorer).
To make a popup window I used java script some thing like
window.open(‘url to popup’, ‘popup window name’, ‘other parameter’);
Any one can get some help from this link.
The problem I faced that I used the window name with spaces like ‘my window’. It works fine in ‘firefox like browser’ except in IE. When I used the window name ‘mywindow’ (see know space in window name), the code worked in IE too.
I don’t like internet explorer at all..
Note: I am novice in java script…. 
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Last Update on November 30th, 2007
More link about popup window is here.
I faced the exactly same problem.
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You are wondering about IE. But now so many version of IE are there on user computer that even a simple js will not workout.
Try using some js frameworks. They will take care cross browser comparibility.