"Stop running this script" error in IE7 and IE8 while trying to navigate to another page

I have created a Drupal website that uses Openlayers to display maps. In one of these maps there are some "Filters" which the user can use to dynamically change the data shown in the map. The data are related to countries are shown as bubb开发者_如何学JAVAles over the countries. The bubbles are drawn using Openlayers' API. A good amount of calculations go behind the scene while filters are selected. I have used setTimeout to avoid long running loops. The filters work fine. However, after a number of filters are clicked (e.g. if 12 filters are clicked), if the user tries to move to another page by clicking a link, in IE7 and IE8 the following error shows -

"Stop running this script?

A script on this page is causing your web browser to run slowly. If it continues to run, your computer might become unresponsive."

This error does not show in any other browser and does not show in IE7, 8 until a link is clicked. Any pointer in this regard will be highly appreciated.

UPDATE : The problem was in OpenLayers' event cache. OpenLayers's clears the event cache in the window unload event and this was getting stuck in IE7 and IE8 (I am not sure why). So far I have been able to solve the issue when user clicks another link, by calling OpenLayers.Event.unloadCache() on click of normal links.

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