if (!window.XMLHttpRequest)   
{  
    Event.observe(window, 'load', function() 
    {  
        if (Prototype.Browser.IE) 
        {
            $$('table.ResidenceTable tbody tr').each( function(e)
            {
                Event.observe(e, 'mouseover', function() 
                {  
                    if(Element.hasClassName(e,'ResidenceRow1'))
                    {
                        Element.removeClassName(e,'ResidenceRow1');
                        Element.addClassName(e, 'hover1');
                    }
                    if(Element.hasClassName(e,'ResidenceRow2'))
                    {
                        Element.removeClassName(e,'ResidenceRow2');
                        Element.addClassName(e, 'hover2');
                    }
                });
                Event.observe(e, 'mouseout', function() 
                {
                    if(Element.hasClassName(e,'hover1'))
                    {
                        Element.removeClassName(e, 'hover1');
                        Element.addClassName(e, 'ResidenceRow1'); 
                    }
                    if(Element.hasClassName(e,'hover2'))
                    {
                        Element.removeClassName(e, 'hover2');
                        Element.addClassName(e,'ResidenceRow2');
                    }   
                });
            });        
        }
    });
}