[Nexus]

var obj={a:{b:'c'}},
	key='a.b.c',
	get_object_property_by_key=function(object,key){
		if(typeof object!='object')
			return object;
		
		key=key.split('.');
		for(var i=0;i<key.length;i++){
			if(!object[key[i]])
				return object;
			else
				object=object[key[i]];
		};
			
		return object;
	};
	
	alert(get_object_property_by_key(obj,key));