background.js

console.log( 'Background.html starting!' );
	/*Put page action icon on all tabs*/
	chrome.tabs.onUpdated.addListener(function(tabId) {
		chrome.pageAction.show(tabId);
	});

	chrome.tabs.getSelected(null, function(tab) {
		chrome.pageAction.show(tab.id);
	});
	
	/*Send request to current tab when page action is clicked*/
	chrome.pageAction.onClicked.addListener(function(tab) {
		chrome.tabs.getSelected(null, function(tab) {
			chrome.tabs.sendRequest(
				//Selected tab id
				tab.id,
				//Params inside a object data
				{callFunction: "toggleSidebar"}, 
				//Optional callback function
				function(response) {
					console.log(response);
				}
			);
		});
	});
console.log( 'Background.html done.' );