/**
shows the spinner
@param spinner_id the id of the spinner element
*/
function showSpinner(spinner_id,title){

	if (!spinner_id) spinner_id = 'spinner';
	if (!title) title = 'Loading ...';

	var spinner = $('#'+spinner_id);
	spinner.dialog({ show: 'slide',title:''+title,modal: true});

}
/**
hide the spinner
@param spinner_id the id of the spinner element
*/
function hideSpinner(spinner_id){

	if (!spinner_id) spinner_id = 'spinner';
	var spinner = $('#'+spinner_id);
	spinner.dialog("close");

}