var activeEl = $('none');
var fadetime = 200;
var inactive = $('none');
var opacity = 0.75;

function fadeTo(elId){
  var el = $(elId);
  if (activeEl == $('none')){
      el.set('tween', {duration: fadetime});
	    el.tween('opacity', opacity);
	    activeEl = el;
	}else {
      if (activeEl == el){
          el.set('tween', {duration: fadetime});
    	    el.tween('opacity', 0);
    	    activeEl = inactive;
    	}else {
    	    el.set('tween', {duration: fadetime});
    	    el.tween('opacity', opacity);
    	    activeEl.set('tween', {duration: fadetime});
    	    activeEl.tween('opacity', 0);
    	    activeEl = el;
    	}
  }	
}

/*
window.addEvent('domready', function() {	
	
		var el = new Array();
    for (var n=0; n < livingDescriptions.length ; n++)
    {   
    	 //alert(livingDescriptions.length);
       el[livingDescriptions[n]] = $('description' + livingDescriptions[n]);
       // el.set('tween', {duration: 0});
	     // el.tween('opacity', 0);
	      
	      //var n = el.id.match(/[\d\.]+/g);
	      $('img' + livingDescriptions[n]).addEvent('click', function(){
	        alert(el.id);
	        fadeTo('description' + livingDescriptions[n]);	        
	      });
    }
    
    
});*/