function fnHide(){
	var obj=document.getElementById("link1")
	var objImg=document.getElementById("ico_hide")
	if(obj.className=='link1'){
		obj.className='link_show'
		objImg.setAttribute('src','images/minus.gif');
	}else{
		obj.className='link1'
		objImg.setAttribute('src','images/plus.gif');
	}
}