BannerPos = {
    change: function(){
        var currentWindowWidth = document.viewport.getDimensions().width;
        var bodyWidth = $('main_body').getDimensions().width;
        if (currentWindowWidth < (bodyWidth+330)) {
            var helpLinkPosition = Math.round((bodyWidth - (currentWindowWidth - 360))/2);
            helpLinkPosition = helpLinkPosition+'px';
            helpLinkPosition = "2px " + helpLinkPosition + " 2px 3px"
            $('help_link').setStyle ({
                'padding': helpLinkPosition
            });
        }
        else {
            $('help_link').setStyle ({
                'padding': '2px 3px'
            });
        }
    }
}