function chgcontent(i,t_id) {
	var objbtn=document.getElementById("imgbtn"+i);
	var objdesc=document.getElementById("desc"+i);
	
	if(objbtn.src.indexOf("plus")==-1) {
		objbtn.src="/renwu/template/" + t_id + "/images/plus.gif";
		objdesc.style.visibility="hidden";
		objdesc.style.display='none';
	} else {
		objbtn.src="/renwu/template/" + t_id + "/images/sub.gif"
		objdesc.style.visibility="visible";
		objdesc.style.display='';
		
	}
}