how do i avoid including jquery twice?
<p>i have a service i'm building, which will be included as JS on client web pages. optimally, i want to build the service using jquery.</p>

<p>the case may arise, where the page already has JQ included.</p>

<p>how do i avoid including JQ twice in the page? how do i make sure i still have the desired JQ functionality, even if the page has already included an older version of JQ?</p>

<p>is the only solution simply abandoning JQ and going with hand-coded script?</p>
