rem: if (item) 
add: if (item) 
context:     showItem : function ( itemOrId, show ) {        var item = itemOrId.constructor == String ? document.getElementById(itemOrId) : itemOrId;        if (item)           item.hidden = !show;    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/f9db07abc5a5b14b11dbc123fb543db6c61a19a1/browser.js/clean/browser/base/content/browser.js