text: window.onload = function(){
     document.getElementById('lg').onclick = function() {
  	  chrome.windows.update(chrome.windows.WINDOW_ID_CURRENT, {width: 1200});
  	}
  	 document.getElementById('md').onclick = function() {
  	  chrome.windows.update(chrome.windows.WINDOW_ID_CURRENT, {width: 992});
  	}
  	 document.getElementById('sm').onclick = function() {
  	  chrome.windows.update(chrome.windows.WINDOW_ID_CURRENT, {width: 768});
  	}
  	 document.getElementById('xs').onclick = function() {
  	  chrome.windows.update(chrome.windows.WINDOW_ID_CURRENT, {width: 512});
  	}
  };