How to get away from the script error in my webpage?

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VB

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JScript.NET

Dear friends,
In my .NET webpage i m using a modal dialog popup window to show the report by passing url and title. I got a script error when i call that dialog window in my IE8 browser, "Object doesn't support this property or method". The script I m using as follows,

function openDialog(title,url)   {
    $('<div>').html('loading...').dialog({
        modal: true,
        open: function ()
        {
            $(this).load(url).dialog("open");
        },
        close: function(event, ui) {
            $(this).dialog( "close" );
        },
        height: 500,
        width: '80%',
        title: title,
        cache: false
    });
}