turn_light_off_for_firefox.js

(function (){
 if (window.top != window.self) return; //don't run on frames or iframes
 var b, curtain, elem;
 var specialsites = [
 //[name, url, flash player parentNode XPath]
 ['Sohu', 'http://tv.sohu.com/', '//div[@id="sohuplayer"]']
 ,['Sina', 'http://video.sina.com.cn/', '//div[@id="myflashBox"]']
 ,['Sina', 'http://video.sina.com.cn/', '//div[@id="flashPlayer"]']
 ,['ku6', 'http://v.ku6.com/', '//div[@class="videoPlay"]']
 ,['tudou', 'http://www.tudou.com/playlist', '//object[@id="playerObject"]']
 ,['renren', 'http://share.renren.com/', '//div[@id="sharevideo"]']
 ]
 var len = specialsites.length;
 var url = document.location.href;
 for (i=0;i<len;i++) {
 if (url.indexOf(specialsites[i][1]) == 0) {
 elem = document.evaluate(specialsites[i][2],document,null,XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,null).snapshotItem(0);
 if (elem) break;
 }
 }

 makeswitch();
 lightsoff();
 lightson();

 function makeswitch() {
	 //create switcher button
	 b = document.createElement('div');
	 b.setAttribute('style', 'width: 80px; height: 25px; top: 10%; right: 0; z-index: 900000; position: fixed; color: white; background: black;opacity:0.6;text-align: center; vertical-align: middle; font-size: 9pt; cursor: pointer;-moz-border-radius:10px 0 0 10px;');
	 b.innerHTML = 'TurnOff';
	 b.addEventListener('click', lightsoff, false);
	 //insert button
	 document.body.appendChild(b);
 }

 function lightsoff() {
	 if (curtain) curtain.style.display = 'block';
	 else {
		 curtain = document.createElement('div');
		 curtain.innerHTML = 'Double Click to turn lights back on.';
		 curtain.title = 'Double Click to turn lights back on.';
		 curtain.setAttribute('style', 'width: 100%; height: 100%; top: 0; left: 0; z-index: 10000; position: fixed; color: #eee; background: black; text-align: right; opacity: 0.9;');
		 curtain.addEventListener('dblclick', lightson, false);
		 document.body.appendChild(curtain);
	 }
	 b.style.display = 'none';  //hide button
	 if (elem) {
		 fixZIndex(elem);
		 //setTimeout(fixZIndex,4000,elem);
	 }
 }

 function lightson() {
	 b.style.display = 'block';
	 curtain.style.display = 'none';
 }

 function fixZIndex(elem) {
	 elem.style.position = 'relative';
	 elem.style.zIndex = '10001';
 }
})();