function select2Tab(id)
{
	//set all tables to invisible
	document.getElementById('tab21').style.display='none';
	document.getElementById('tab22').style.display='none';
    
	//set the selected table only back to visible
	document.getElementById(id).style.display=''; 
    
	//set both tab links to no style
	document.getElementById('tab21_link').className='sec_tabs';
	document.getElementById('tab22_link').className='sec_tabs';
    
	//set the selected tab to the selected style
	document.getElementById(id + '_link').className='sec_tabsel';
}
function select3Tab(id)
{
	//set all tables to invisible
	document.getElementById('tab31').style.display='none';
	document.getElementById('tab32').style.display='none';
	document.getElementById('tab33').style.display='none';
    
	//set the selected table only back to visible
	document.getElementById(id).style.display=''; 
    
	//set both tab links to no style
	document.getElementById('tab31_link').className='sec_tabs';
	document.getElementById('tab32_link').className='sec_tabs';
	document.getElementById('tab33_link').className='sec_tabs';
    
	//set the selected tab to the selected style
	document.getElementById(id + '_link').className='sec_tabsel';
}
function select4Tab(id)
{
	//set all tables to invisible
	document.getElementById('tab41').style.display='none';
	document.getElementById('tab42').style.display='none';
	document.getElementById('tab43').style.display='none';
	document.getElementById('tab44').style.display='none';
    
	//set the selected table only back to visible
	document.getElementById(id).style.display=''; 
    
	//set both tab links to no style
	document.getElementById('tab41_link').className='sec_tabs';
	document.getElementById('tab42_link').className='sec_tabs';
	document.getElementById('tab43_link').className='sec_tabs';
	document.getElementById('tab44_link').className='sec_tabs';
    
	//set the selected tab to the selected style
	document.getElementById(id + '_link').className='sec_tabsel';
}