Fade out all matched elements by adjusting their opacity and firing an optional callback after completion. Only the opacity is adjusted for this animation, meaning that all of the matched elements should already have some form of height and width associated with them. fadeIn(String|Number,Function) fadeTo(String|Number,Number,Function) (optional) A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000). (optional) A function to be executed whenever the animation completes. $("p").fadeOut("slow"); $("p").fadeOut("slow",function(){ alert("Animation Done."); });