if (/^\s*this.src\s*=\s*\'([^\']+)\';?\s*$/.test(dom.getAttrib(n, 'onmouseover')))
                nl.onmouseoversrc.value = dom.getAttrib(n, 'onmouseover').replace(/^\s*this.src\s*=\s*\'([^\']+)\';?\s*$/, '$1');