function subopen(id){
	var obj=document.getElementById("sub"+id).style.display;
	if(obj=="none"){
		document.getElementById("sub"+id).style.display="";
		document.getElementById("plus"+id).src="../images/minus.gif";
		}else{
		document.getElementById("sub"+id).style.display="none";
		document.getElementById("plus"+id).src="../images/plus.gif";
	}
}