[jQuery] window.onbeforeunload fires in IE when a JQuery UI Dialog is opened

[Sarge]

This is very frustrating.  I have the following code
$(window).bind("beforeunload", function()
        {
                // get's instances to all three editors
                var edMainT = FCKeditorAPI.GetInstance('edMain');
                var edSecondaryT = FCKeditorAPI.GetInstance('edSecondary');
                var edAdditionalT = FCKeditorAPI.GetInstance('edAdditional');
                // check to see if the editors are dirty (have there been any
changes?)
                if (edMainT.IsDirty() || edSecondaryT.IsDirty() ||
edAdditionalT.IsDirty())
                {
                        if (confirm("Changes have been made but not 
saved.\n\nWould you
like to Save before exiting?"))
                        {
                                isExiting = true;
                                Save(false);
                        } // save full (not draft)
                }
                edMainT = null;
                edSecondaryT = null;
                edAdditionalT = null;
        });
Which works awesome in FireFox, but in IE, any time I open a JQuery UI
Dialog or use JQuery to modify the DOM the function runs and a confirm
box pops up.
Below are samples of code that cause this behavior.

$("#divLayoutChooser").dialog({
                title: "Layout Chooser",
                autoOpen: false,
                modal: true,
                width: 450,
                height: 350,
                overlay: {
                        opacity: 0.4,
                        background: "white"
                }
        });

$("#lnkLayout").click(function(event) // will open the dialog to show
the layout chooser
        {
                $("#divLayoutChooser").dialog("open");
        });

or even just modifying the DOM does it, as this code shows.

$("#lnkPreview").click(function(event) // will show preview
        {
                var edMain = FCKeditorAPI.GetInstance('edMain');
                var edSecondary = FCKeditorAPI.GetInstance('edSecondary');
                var edAdditional = FCKeditorAPI.GetInstance('edAdditional');
                edMainText = edMain.GetXHTML();
                edSecondaryText = edSecondary.GetXHTML();
                edAdditionalText = edAdditional.GetXHTML();

                edMain = null;
                edSecondary = null;
                edAdditional = null;

                $("#pvMain").html(edMainText);
                $("#pvSecondary").html(edSecondaryText);
                $("#pvAdditional").html(edAdditionalText);
                $("#pvPageTitle").html("<h1>" + $("#tbxPageTitle").val() + 
"</h1>");

                $("#fckToolBar").css("display", "none");
                $("#fckToolBar2").css("display", "none");
                $("#toolbar").css("visibility", "visible");

                $("#edMain").css("display", "none");
                $("#edSecondary").css("display", "none");
                $("#edAdditional").css("display", "none");
                $("#tbxPageTitle").css("display", "none");

                $("#pvMain").css("display", "block");
                $("#pvSecondary").css("display", "block");
                $("#pvAdditional").css("display", "block");
                $("#pvPageTitle").css("display", "block");
        });

Does anyone have any ideas why this is happening?
Anyone run into this before?

Thanks so much for your time!