I have a div that acts like a drop-down. So it pops-up when you click a button and it allows you to scroll through this big list. So the div has a vertical scroll bar. The
Perhaps try adding the tabindex attribute set to -1 to the div node.
I'm having a similar problem with IE firing the blur event when you click on a scrollbar. Apparently it only happens n IE7 and below, and IE8 in quirksmode.
Here's something I found via Google
https://prototype.lighthouseapp.com/projects/8887/tickets/248-results-popup-from-ajaxautocompleter-disappear-when-user-clicks-on-scrollbars-in-ie6ie7
Basically you only do the blur if you know the person clicked somewhere on the document other than the currently focused div. It's possible to inversely detect the scrollbar click because document.onclick doesn't fire when you click on the scrollbar.