$("#toolBox").css("display","block")这是什么用法，谁能帮忙解释下吗？
如题，
<script   type= "text/javascript ">
      $(document).ready(function(){
$( "#choose   #clientClick ").click(function(){   $( "#client-version ").toggle()})
$( "#choose   #clientClick ").blur(function(){   window.setTimeout( "$( '#client-version ').css( 'display ', 'none ') ",300)})
$( "#choose   #patchClick ").click(function(){   $( "#patchlist ").toggle()})
$( "#choose   #patchClick ").blur(function(){   window.setTimeout( "$( '#patchlist ').css( 'display ', 'none ') ",300)})
$( 'ul#fadebanner ').innerfade({
speed:   'slow ',
timeout:   2500,
type:   'sequence ',
containerheight:   '72px '
  });
ShowSeverStatus();
$( "#serverStatus   li,.calendar   img ").mousemove(function(callingEvent){if   (!callingEvent)   callingEvent=window.event;mouseX=callingEvent.clientX;mouseY=callingEvent.clientY-1;$( "#toolBox ").css( "left ",mouseX+ "px ");$( "#toolBox ").css( "top ",mouseY+20+document.documentElement.scrollTop+ "px ");$( "#toolBox ").html($(this).attr( "name "));$( "#toolBox ").css( "display ", "block ");});
$( "#serverStatus   li,.calendar   img ").mouseout(function(){$( "#toolBox ").css( "display ", "none ");});
});
这是一个网站的source，也不知道这是什么用法，高人指点下！谢谢了

------解决方案--------------------
这个是JQuery里面的，是一个JAVASCRIPT的框架，类似与PROTOTYPE,但是很小巧