jQuery custom pseudo selectors

jq-psuedo.js

// Returns true if the parent element contains div.nav_level2
jQuery.expr[":"].subnav = function(obj){
  return jQuery(obj).parent().find("div.nav_level2").length;
};

// Using it

$("nav li>a:subnav").click(function(ev){});

$("nav li>a").not(":subnav").css("background-image", "none");


// Simulate :blank CSS selector
$.expr[":"].blank = function(obj){
    return /^[\s|\u00A0]*$/.exec($(obj).text()) !== null;
};

$('p:blank').remove();