getURL, javascript, & IE

I have a question about getURL, javascript, and Internet Explorer. I have a thumbnail gallery that I created in Flash. I have some basic animations & actions with each thumbnail. One of the actions is when someone mouses over a thumbnail, a call to a javascript function performs a basic javascript rollover effect with some non-flash graphics on the same html page. everything works except in IE the javascript effects are not in sync. if you are very slow & deliberate, the javascript function works ok. if you move the mouse at a more normal pace over the thumbnails, the javscript rollovers get out of sync (for lack of a better description). In non IE browsers everything works fine. I searched on google and it looks like there might be an issue with IE and getURL javascript function calls. Has anyone had problems with getURL, javascript, & IE? Thanks in advance for any responses.

Here's the actionscript for the thumbnails.


with (_root.thumb1) {
button.onRelease = function() {
getURL("../html/image1.htm");
};
button.onRollOver = function() {
getURL("javascript: fncOn('dot1','dot_on');");
};
button.onRollOut = function() {
getURL("javascript: fncOff('dot1','dot_off');");
};
}