function toggle_pchart(a_elt, pchart_elt_id)
{
	curStyle = getStyleById(pchart_elt_id, 'display');
	
	if(curStyle == 'block')
		setStyleById(pchart_elt_id, 'display', 'none');
	else
		setStyleById(pchart_elt_id, 'display', 'block');
		
	if(curStyle == 'none')
		a_elt.childNodes[0].replaceData(0, 100, "Hide price chart");
	else
		a_elt.childNodes[0].replaceData(0, 100, "Purchase tickets");
}