var mouseEnterFunction1 = function() {
    $('MainItem1').set('style', '');
    $('MainItem2').set('style', 'display:none');
    $('MainItem3').set('style', 'display:none');
    $('MainItem4').set('style', 'display:none')
};


var mouseEnterFunction2 = function() {
    $('MainItem1').set('style', 'display:none');
    $('MainItem2').set('style', '');
    $('MainItem3').set('style', 'display:none');
    $('MainItem4').set('style', 'display:none');
};

var mouseEnterFunction3 = function() {
    $('MainItem1').set('style', 'display:none');
    $('MainItem2').set('style', 'display:none');
    $('MainItem3').set('style', '');
    $('MainItem4').set('style', 'display:none');
};

var mouseEnterFunction4 = function() {
    $('MainItem1').set('style', 'display:none');
    $('MainItem2').set('style', 'display:none');
    $('MainItem3').set('style', 'display:none');
    $('MainItem4').set('style', '');
};

window.addEvent('domready', function() {
    $('FeaturedSideItem1').addEvent('mouseenter', mouseEnterFunction1);
    $('FeaturedSideItem2').addEvent('mouseenter', mouseEnterFunction2);
    $('FeaturedSideItem3').addEvent('mouseenter', mouseEnterFunction3);
    $('FeaturedSideItem4').addEvent('mouseenter', mouseEnterFunction4);
    $('heading-box').addEvent('mouseleave', mouseEnterFunction1);   
});