var id_open;

function showHide(id){

	if (id_open != null && id_open != id){
	document.getElementById(id_open).style.display = 'none';
	}

	if (document.getElementById(id).style.display == 'block'){

	    document.getElementById(id).style.display = 'none';

	}
	else{

		document.getElementById(id).style.display = 'block';
		id_open=id;
	}

}