Nextgen with shutter effect: can't close pictures with internet explorer 8

I have site with nextgen-gallery plugin. I use the singlepic gallery to show products. When I test it with Internet explorer 8, pictures will open normally with shutter effect, but I cannot close them. Image just disappear for very short moment and then come right back. Only way to get out of shutter effect is press back on browser.

Gallery works fine with firefox, chrome, safari and even IE8 on another computer. I’ve also noticed that it works even on this computer and browser, if IE’s browser window is not maximized!

I think that problem comes from here:

D.innerHTML = '<div id="shWrap"><img src="" id="shTopImg" title="' + t.msgClose + '" onload="shutterReloaded.showImg();" onclick="shutterReloaded.hideShutter(); event.returnValue=false; return false;" />' + NavBar +'</div>';

When I googled about this problem I found out that Internet explorer seems to have some kind of problem with javascript onclick command, but I couldn’t find any solution that could fix it.

Has anyone had this same problem with Nextgen gallery’s shutter effect? It’s driving me crazy ??