jQuery hoverIntent is a plugin used to delay the trigger of mouseover and mouse out of hover function. This helps us to prevent user trigger many times of event when move over a layer.

default hover:

$("#layer").hover(function() {
    //mouserover event
},function() {
    //mouserout event
});

hoverintent:

$("#layer").hoverIntent({
	interval: 500,
	over: function(){
		//mouserover event
	},
	timeout: 500,
	out: function(){
		//mouserout event
	}
});

Plugin site:

http://cherne.net/brian/resources/jquery.hoverIntent.html

options:

over(optional)
desc.： mouseover event
default: null
 
interval(optional)
desc.： delay time to trigger mouseover event
default： 100
timeout(optional)
desc.： delay time to trigger mouseout event
default： 0
 
out(optional)
desc.： mouseout event
default： null
 
sensitivity(optional)
desc.： sensitivity of mouse, minimal 1
default： 7