function showpanelfirst() {
	document.getElementById('panel_1').style.display='block'; 
	document.getElementById('panel_2').style.display='none';
	document.getElementById('panel_3').style.display='none';
	document.getElementById('switchlink1').className='actsort';
	document.getElementById('switchlink2').className='noactsort';
	document.getElementById('switchlink3').className='noactsort';
}
function showpanelsecond() {
	document.getElementById('panel_1').style.display='none'; 
	document.getElementById('panel_2').style.display='block';
	document.getElementById('panel_3').style.display='none'; 
	document.getElementById('switchlink1').className='noactsort';
	document.getElementById('switchlink2').className='actsort';
	document.getElementById('switchlink3').className='noactsort';
}
function showpaneltherd() {
	document.getElementById('panel_1').style.display='none'; 
	document.getElementById('panel_2').style.display='none';
	document.getElementById('panel_3').style.display='block'; 
	document.getElementById('switchlink1').className='noactsort';
	document.getElementById('switchlink2').className='noactsort';
	document.getElementById('switchlink3').className='actsort';
}