function showTag(obj,num,length)
{
 for(var id = 1;id<=length;id++)
 {
  var gdoy=obj+id;
  if(id==num)
	 {
	  document.getElementById(gdoy).style.display="block";
	  document.getElementById("td"+gdoy).style.background='url(images/btn_tag.gif)';
	  document.getElementById("sp"+gdoy).className='men';
	   document.getElementById("sp1"+gdoy).innerHTML="&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<img src='images/xiaohei2.gif' width='4' height='9' align='absmiddle'> ";
	  
	  

	 }
  else
	 {
  document.getElementById(gdoy).style.display="none";
  document.getElementById("td"+gdoy).style.background='url(images/btn_tag2.gif)';
    document.getElementById("sp"+gdoy).className='tt';
	   document.getElementById("sp1"+gdoy).innerHTML="&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;";
	 }
 }  
}