function switchTab(that) {
	document.getElementById('tab1').className='';
	document.getElementById('tab2').className='';
	document.getElementById('tab3').className='';
	document.getElementById('tab4').className='';
	that.parentNode.className='active';
	document.getElementById('tab1c').style.display='none';
	document.getElementById('tab2c').style.display='none';
	document.getElementById('tab3c').style.display='none';
	document.getElementById('tab4c').style.display='none';

	
	document.getElementById(that.parentNode.id+'c').style.display='block';
	return false;
}