Icon01 = new Image(9,9);
Icon01.src = "/img/plus.gif";
Icon02 = new Image(9,9);
Icon02.src = "/img/minus.gif";

function cat_show_hide(id){
	IconName=eval('img'+id);
	Obj=eval('id'+id);
	if (IconName.src == Icon01.src){
		IconName.src = Icon02.src;
		Obj.style.display='block';
	}
	else{
		IconName.src = Icon01.src;
		Obj.style.display='none';
	}
}