var highlightGraphic = new esri.Graphic(evt.graphic.geometry,highlightSymbol); map.graphics.add(highlightGraphic); //Comment out this line to see what I mean!
Only had a quick glance at the code - the FeatureLayer layer that you've connected to is being 'masked' by the highlight graphic that's added when the mouseover occurs.var highlightGraphic = new esri.Graphic(evt.graphic.geometry,highlightSymbol); map.graphics.add(highlightGraphic); //Comment out this line to see what I mean!
Why not make the hyperlink an infoWindow item, since the infoWindow is already popped-up for you by the mouseover event? 🙂
HTH