function tab(obj)
{
	for(i=1; i<6;i++)
	{
		document.getElementById("li_"+i).className = "hdbtn_liang";
		document.getElementById("gjz_"+i).style.display = "none";
		document.getElementById("c"+i).style.display = "none";

	}   
	document.getElementById("li_"+obj).className = "hdbtn_hui";
	document.getElementById("gjz_"+obj).style.display = "block";
	document.getElementById("c"+obj).style.display = "block";

	
}