(function($){$.userMode=(function(){var userBg,timer,testDiv,boundEvents=0;function testBg(){testDiv=testDiv||$('<div></div>').css({position:'absolute',left:'-999em',top:'-999px',width:'0px',height:'0px'}).appendTo('body');var black=$.curCSS(testDiv.css({backgroundColor:'#000000'})[0],'backgroundColor',true),white=$.curCSS(testDiv.css({backgroundColor:'#ffffff'})[0],'backgroundColor',true),newBgStatus=(black===white||white==='transparent');if(newBgStatus!=userBg){userBg=newBgStatus;$.event.trigger('_internalusermode');}
return userBg;}
function init(){testBg();timer=setInterval(testBg,3000);}
function stop(){clearInterval(timer);testDiv.remove();testDiv=null;}
$.event.special.usermode={setup:function(){(!boundEvents&&init());boundEvents++;var jElem=$(this).bind('_internalusermode',$.event.special.usermode.handler);setTimeout(function(){jElem.triggerHandler('_internalusermode');},1);return true;},teardown:function(){boundEvents--;(!boundEvents&&stop());$(this).unbind('_internalusermode',$.event.special.usermode.handler);return true;},handler:function(e){e.type='usermode';e.disabled=!userBg;e.enabled=userBg;return jQuery.event.handle.apply(this,arguments);}};return{get:testBg};})();$.fn.userMode=function(fn){return this[(fn)?'bind':'trigger']('usermode',fn);};$(function(){$('html').userMode(function(e){$('html')[e.enabled?'addClass':'removeClass']('hcm');});});})(jQuery);