How jquery resolves version conflicts

<!--Introduction to 1.6.4 version of JQ---<scriptsrc="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.js"></script><script> var jq164 = jQuery.noConflict(true); </script><!-- 引入1.4.2版的jq --><scriptsrc="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.js"></script><script> var jq142 = jQuery.noConflict(true); </script><script>(function($){    //此时的$是jQuery-1.6.4    $(‘#header‘);})(jq164);</script><script>(function($){    //此时的$是jQuery-1.4.2    $(‘#footer‘);})(jq142);</script>

<script type= "Text/javascript" >
jq164 (function () {//$ () {
jq164 ("Body"). Sonline ({//$ ("body"). Sonline ({
Position: "Right",
TOP:100,
Effect:true,
Defaultsopen:{if $HOME [' show_company_online ']== ' open '}true{elseif $HOME [' Show_company_online ']== ' show '}true{else }FALSE{/IF}
});
{if $HOME [' Show_company_online ']== ' open '}
{ElseIf $HOME [' Show_company_online ']== ' show '}
Wintopii66 (' qqz_01 ');
Wintopii66 (' qqz_02 ');
Wintopii66 (' qqz_03 ');
{Else}
{/if}
})
</script>

How jquery resolves version conflicts