rem: var text = document.createElementNS(kXULNS, "label"); 
add: var text = document.createElementNS(kXUL_NS, "label"); 
context:   _tileImage: function ()  {    var bundle = document.getElementById("backgroundBundle");    this._monitor.style.backgroundColor = "white";    var text = document.createElementNS(kXULNS, "label");    text.setAttribute("id", "noPreviewAvailable");    text.setAttribute("value", bundle.getString("DesktopBackgroundNoPreview"));    this._monitor.appendChild(text);  },
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/7393429db2e21061a3979dbded0c84d15dfc9409/setDesktopBackground.js/buggy/browser/components/shell/content/setDesktopBackground.js