siblings

list
list
list
list
list

$('#ex1').children().click(function(){
	$(this).siblings().css({'background':'#007374'});
	$(this).css({'background':'none'});
});

next

list
list
list
list
list

$('#ex2').children().click(function(){
	$(this).next().css({'background':'#007374'});
});

nextAll

list
list
list
list
list

$('#ex3').children().click(function(){
	$(this).nextAll().css({'background':'#007374'});
});

prev

list
list
list
list
list

$('#ex4').children().click(function(){
	$(this).prev().css({'background':'#007374'});
});

prevAll

list
list
list
list
list

$('#ex5').children().click(function(){
	$(this).prevAll().css({'background':'#007374'});
});