Javascript regular expression that replaces html tags

I want to use a regular expression in javascript to replace all occurances of

</tr><tr>

with

<td>&nbsp;&nbsp;</td>

Also, there can be whitespace between the </tr> tag 开发者_StackOverflow中文版and the <tr> tag

Thanks!!

result = subject.replace(/<\/tr>\s*<tr>/g, "<td>&nbsp;&nbsp;</td>");