tsuka

kzさん早速のご回答ありがとうございました
http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js
から
http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js
に変更しましたが同じさどうでした＞＜
ちなみに
私なりに調べてみたら
WordPressの場合は$の代わりにjQueryを使います。
wp_enqueue_scriptを使ってと二個の注意点がありますが
下記をどのようにしたらよいのでしょうか

<!-- The JavaScript -->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script type="text/javascript" src="http://kappouen.com/wp-content/themes/neutra/jquery.bgpos.js"></script>
		<script type="text/javascript">
            $(function() {
                /* position of the <li> that is currently shown */
                var current = 0;

				var loaded  = 0;
				for(var i = 1; i <4; ++i)
					$('<img />').load(function(){
						++loaded;
						if(loaded == 3){
							$('#bg1,#bg2,#bg3').mouseover(function(e){

								var $this = $(this);
								/* if we hover the current one, then don't do anything */
								if($this.parent().index() == current)
									return;

								/* item is bg1 or bg2 or bg3, depending where we are hovering */
								var item = e.target.id;

								/*
								this is the sub menu overlay. Let's hide the current one
								if we hover the first <li> or if we come from the last one,
								then the overlay should move left -> right,
								otherwise right->left
								 */
								if(item == 'bg1' || current == 2)
									$('#menu .sub'+parseInt(current+1)).stop().animate({backgroundPosition:"(-266px 0)"},300,function(){
										$(this).find('li').hide();
									});
								else
									$('#menu .sub'+parseInt(current+1)).stop().animate({backgroundPosition:"(266px 0)"},300,function(){
										$(this).find('li').hide();
									});

								if(item == 'bg1' || current == 2){
									/* if we hover the first <li> or if we come from the last one, then the images should move left -> right */
									$('#menu > li').animate({backgroundPosition:"(-800px 0)"},0).removeClass('bg1 bg2 bg3').addClass(item);
									move(1,item);
								}
								else{
									/* if we hover the first <li> or if we come from the last one, then the images should move right -> left */
									$('#menu > li').animate({backgroundPosition:"(800px 0)"},0).removeClass('bg1 bg2 bg3').addClass(item);
									move(0,item);
								}

								/*
								We want that if we go from the first one to the last one (without hovering the middle one),
								or from the last one to the first one, the middle menu's overlay should also slide, either
								from left to right or right to left.
								 */
								if(current == 2 && item == 'bg1'){
									$('#menu .sub'+parseInt(current)).stop().animate({backgroundPosition:"(-266px 0)"},300);
								}
								if(current == 0 && item == 'bg3'){
									$('#menu .sub'+parseInt(current+2)).stop().animate({backgroundPosition:"(266px 0)"},300);
								}

								/* change the current element */
								current = $this.parent().index();

								/* let's make the overlay of the current one appear */

								$('#menu .sub'+parseInt(current+1)).stop().animate({backgroundPosition:"(0 0)"},300,function(){
									$(this).find('li').fadeIn();
								});
							});
						}
					}).attr('src', 'images/'+i+'.jpg');

                /*
                dir:1 - move left->right
                dir:0 - move right->left
                 */
                function move(dir,item){
                    if(dir){
                        $('#bg1').parent().stop().animate({backgroundPosition:"(0 0)"},200);
                        $('#bg2').parent().stop().animate({backgroundPosition:"(-266px 0)"},300);
                        $('#bg3').parent().stop().animate({backgroundPosition:"(-532px 0)"},400,function(){
                            $('#menuWrapper').removeClass('bg1 bg2 bg3').addClass(item);
                        });
                    }
                    else{
                        $('#bg1').parent().stop().animate({backgroundPosition:"(0 0)"},400,function(){
                            $('#menuWrapper').removeClass('bg1 bg2 bg3').addClass(item);
                        });
                        $('#bg2').parent().stop().animate({backgroundPosition:"(-266px 0)"},300);
                        $('#bg3').parent().stop().animate({backgroundPosition:"(-532px 0)"},200);
                    }
                }
            });
 </script>

わかる方よろしくお願いします。