[Nexus]

var timeout=false,
	links=document.getElementsByTagName('a'),
	i;
	
for(i=0;i<links.length;i++){
	var self=links.length[i];
	self.onmouseenter=function(e){
		if(timeout!==false)
			clearTimeout(timeout);
		
		timeout=setTimeout(function(){
			timeout=false;
			alert('Achtung!');
		},2*1000);
	};
	
	self.onmouseleave=function(e){
		if(timeout!==false)
			clearTimeout(timeout);
		
		timeout=false;
	};
}