// 导航
function ng1(id,image,zhi)
{
	 var s=document.getElementById(id);
	  s.src=image+".2.jpg";
	  document.getElementById(zhi).style.display="block";
}
function ng2(id,image,zhi)
{
	 var s=document.getElementById(id);
	  s.src=image+".1.jpg";
	  document.getElementById(zhi).style.display="none";
}


function ng3(id,image)
{
	 var s=document.getElementById(id);
	  s.src=image+".2.jpg";
}
function ng4(id,image)
{
	 var s=document.getElementById(id);
	  s.src=image+".1.jpg";
}