jquery of javascript parse xml

Hi,
I have a webservice response that comes back as xml text.  Can someone please tell me how to make a function (or statment) that can get

session-id out of this string?

<?xml version="1.0"?><amtd><result>OK</result><xml-log-in><session-id>83D7D6CB23366AE5BF6D2846000FD71F.5krocvxvOyOCZsGalRLdzQ</session-id><user-id>xxxxxx</user-id><cdi>dddddd</cdi><timeout>55</timeout><login-time>2013-05-17 16:05:55 EDT</login-time><associated-account-id>xxxxxx</associated-account-id><nyse-quotes>realtime</nyse-quotes><nasdaq-quotes>realtime</nasdaq-quotes><opra-quotes>realtime</opra-quotes><amex-quotes>realtime</amex-quotes><cme-quotes>delayed</cme-quotes><ice-quotes>delayed</ice-quotes><forex-quotes>delayed</forex-quotes><exchange-status>non-professional</exchange-status><authorizations><options360>false</options360></authorizations><accounts><account><account-id>xxxxxx</account-id><display-name>xxxxxx</display-name><cdi>dddddddd</cdi><description>xxxx MILLMAN</description><associated-account>true</associated-account><company>AMER</company><segment>ADVNCED</segment><unified>true</unified><preferences><express-trading>false</express-trading><option-direct-routing>false</option-direct-routing><stock-direct-routing>false</stock-direct-routing></preferences><authorizations><apex>true</apex><level2>true</level2><stock-trading>true</stock-trading><margin-trading>true</margin-trading><streaming-news>true</streaming-news><option-trading>full</option-trading><streamer>true</streamer><advanced-margin>true</advanced-margin></authorizations></account><account><account-id>ddddd</account-id><display-name>xxxxxxroth</display-name><cdi>ddddd</cdi><description>xxx TD</description><associated-account>false</associated-account><company>AMER</company><segment>ADVNCED</segment><unified>true</unified><preferences><express-trading>false</express-trading><option-direct-routing>false</option-direct-routing><stock-direct-routing>false</stock-direct-routing></preferences><authorizations><apex>true</apex><level2>true</level2><stock-trading>true</stock-trading><margin-trading>true</margin-trading><streaming-news>true</streaming-news><option-trading>spread</option-trading><streamer>true</streamer><advanced-margin>true</advanced-margin></authorizations></account><account><account-id>dddddddd</account-id><display-name>xxxxxxira</display-name><cdi>dddddd</cdi><description>xxxxxx IRA</description><associated-account>false</associated-account><company>AMER</company><segment>ADVNCED</segment><unified>true</unified><preferences><express-trading>false</express-trading><option-direct-routing>false</option-direct-routing><stock-direct-routing>false</stock-direct-routing></preferences><authorizations><apex>true</apex><level2>true</level2><stock-trading>true</stock-trading><margin-trading>true</margin-trading><streaming-news>true</streaming-news><option-trading>spread</option-trading><streamer>true</streamer><advanced-margin>true</advanced-margin></authorizations></account></accounts></xml-log-in></amtd>