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: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/2fb9feaadc992e3ccd442db789244b253d0427f8/browser.js/buggy/browser/base/content/browser.js