function switchChart(index)
{
	document.getElementById('chart').src='/images/charts/' + index.toLowerCase() +'.jpg'; 
	document.getElementById('charttab_IMC').className=""; 
	document.getElementById('charttab_UX').className=""; 
	document.getElementById('charttab_PFTS').className=""; 
	document.getElementById('charttab_' + index).className="sel"; 
	return(false);
}