var li=document.getElementsByTagName("li"),ul=document.getElementsByTagName("ul");
li[1].onmouseover=function(){li[1].setAttribute("id","this");ul[1].setAttribute("id","show");}
li[1].onmouseout=function(){ul[1].removeAttribute("id");li[1].removeAttribute("id")}

li[9].onmouseover=function(){li[9].setAttribute("id","this");ul[2].setAttribute("id","show");}
li[9].onmouseout=function(){ul[2].removeAttribute("id");li[9].removeAttribute("id")}

li[14].onmouseover=function(){li[14].setAttribute("id","this");ul[3].setAttribute("id","show");}
li[14].onmouseout=function(){ul[3].removeAttribute("id");li[14].removeAttribute("id")}