function switch_block(block){
	if(block == 'spirit'){
		document.getElementById('spirit').style.display = 'block';
		document.getElementById('surr').style.display = 'none';
		document.getElementById('comm').style.display = 'none';
		
		
		document.getElementById('spirit_head').setAttribute("class", "a");
		document.getElementById('surr_head').setAttribute("class", "dis");
		document.getElementById('comm_head').setAttribute("class", "dis");
  				
	}
	if(block == 'surr'){
		document.getElementById('surr').style.display = 'block';
		document.getElementById('spirit').style.display = 'none';
		document.getElementById('comm').style.display = 'none';
		
		document.getElementById('surr_head').setAttribute("class", "a");
		document.getElementById('spirit_head').setAttribute("class", "dis");
		document.getElementById('comm_head').setAttribute("class", "dis");
	}
	if(block == 'comm'){
		document.getElementById('comm').style.display = 'block';
		document.getElementById('spirit').style.display = 'none';
		document.getElementById('surr').style.display = 'none';
		document.getElementById('comm_head').setAttribute("class", "a");
		document.getElementById('surr_head').setAttribute("class", "dis");
		document.getElementById('spirit_head').setAttribute("class", "dis");
	}
}