function changebg(id,counts,image1,image2,flag)
{
//单击更换指定td的背景
var
   bg_name=eval('bg_'+id);
   main_name= eval('main'+id);
 for(var i=1;i<=counts;i++)
  {
	if(i==id)
	{ 
	  if(flag==id)
	  {
		  bg_name.style.background = 'url(../image/top_4_1.gif)';
	  }
	  else
	  {
	   bg_name.style.background = 'url('+image2+')';
	  }
	  main_name.style.display = "block";
	}
	else
	{
	  if(flag==i)
	  {
		 (eval('bg_'+i)).style.background = 'url(../image/top_4.gif)';
	  }
	  else
	  {
	    (eval('bg_'+i)).style.background = 'url('+image1+')';
	  }
	  (eval('main'+i)).style.display="none";
	}
  }
}
function changeme(id,counts,image1,image2,name1,name2,name3,classname1,classname2)
{
	var 
	   bg_name=eval(name1+id);
       main_name= eval(name2+id);
	   sclass=eval(name3+id);
	   
  for(var i=1;i<=counts;i++)
  {
	 if(i==id) 
	 {
		 bg_name.style.background = 'url('+image1+')'; 
		 sclass.className=classname1;
		 main_name.style.display = "block";
	 }
	 else
	 {
		(eval(name1+i)).style.background = 'url('+image2+')'; 
		(eval(name3+i)).className=classname2;
		(eval(name2+i)).style.display = "none";
	 }
  }

}
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