function changeVisible(obj, id){
	if($(id).style.display == "" || $(id).style.display == "none"){
		$(id).style.display = 'block';
		obj.src = "images/ico-mehr-on.gif";
	}
	else{
		$(id).style.display = 'none';
		obj.src = "images/ico-mehr.gif";
	}
}