function change3(div_num3)
{
var i3;
for(i3=1;i3<=10;i3++)
{
  if(i3==div_num3)
   {	 
     document.getElementById("body3_"+i3).style.display="block";
     document.getElementById("head3_"+i3).className="m_tit1";
   }
  else
   {
     document.getElementById("body3_"+i3).style.display="none";
     document.getElementById("head3_"+i3).className="m_tit";
   }
}
}