/*
*????change_div(td_now,td_click,td_name,td_num)
*????:??????????????
*     ????id??????????????
*	  ??id=main_1,id=main_2...??????????ID????????id=main_11,id=main_22...
*/
function GetObj(objName){
 if(document.getElementById){
  return document.getElementById(objName);
 }else if(document.layers){
  return document.layers[objName];
 }else if(document.all){
  return document.all[objName];
 }else{
  throw new Error("can not reach the element");
}
}

function change_div(td_now,td_click,td_name,td_num){
	for(var i = 1; i <= td_num; i++){
		//????????????????
		eval("var s_td_" + i +"= GetObj('" + td_name + i + "')");
		eval("s_td_" + i + " .style.display = 'none'");

		//eval("var s_div_" + i + i +"= GetObj('" + td_name + i + i + "')");
		//eval("s_div_" + i + i + ".style.display='none'");
	}
	td_now.style.display='';
	td_click.style.display='';
}