slideDown: function(speed,callback){
return this.animate({height: "show"}, speed, callback);
},
slideUp: function(speed,callback){
return this.animate({height: "hide"}, speed, callback);
},
slideToggle: function(speed, callback){
return this.animate({height: "toggle"}, speed, callback);
},
fadeIn: function(speed, callback){
return this.animate({opacity: "show"}, speed, callback);
},
fadeOut: function(speed, callback){
return this.animate({opacity: "hide"}, speed, callback);
},