window.addEvent('domready', function (){

var action = $$('#contimg');

action.addEvent('mouseleave', function (){
 tDiv = "div1";
 vDiv = "div2";

 if($(tDiv).fx){$(tDiv).fx.stop();}
 if($(vDiv).fx){$(vDiv).fx.stop();}

 $(vDiv).fx = $(vDiv).effect('opacity', {duration: 2000}).start(1);
});

action.addEvent('mouseenter', function (){
 tDiv = "div2";
 vDiv = "div1";

 if($(tDiv).fx){$(tDiv).fx.stop();}
 if($(vDiv).fx){$(vDiv).fx.stop();}
 $(tDiv).fx = $(tDiv).effect('opacity', {duration: 2000}).start(0);
 $(vDiv).fx = $(vDiv).effect('opacity', {duration: 2000}).start(1);
});

});