function menu()
{
  var menu= document.getElementById("nav").getElementsByTagName("li");
  for(i=0;i<menu.length;i++)
	{
	   menu[i].onmouseover=function()
       {
           this.getElementsByTagName("ul")[0].style.display="block";
           this.getElementsByTagName("a")[0].style.color="#990000";
           this.getElementsByTagName("a")[0].style.backgroundColor="#ccc";
           document.getElementById("aa2").getElementsByTagName("a")[0].style.background="";
           document.getElementById("aa3").getElementsByTagName("a")[0].style.background="";
           document.getElementById("aa4").getElementsByTagName("a")[0].style.background="";
           document.getElementById("aa5").getElementsByTagName("a")[0].style.background="";
       }
		menu[i].onmouseout=function()
		{
           this.getElementsByTagName("ul")[0].style.display="none";
           this.getElementsByTagName("a")[0].style.color="#444444";
           this.getElementsByTagName("a")[0].style.backgroundColor="#f6f6f6";
           document.getElementById("aa2").getElementsByTagName("a")[0].style.background="";
           document.getElementById("aa3").getElementsByTagName("a")[0].style.background="";
           document.getElementById("aa4").getElementsByTagName("a")[0].style.background="";
           document.getElementById("aa5").getElementsByTagName("a")[0].style.background="";
       }
  }
}