function tab_menux(id1, id2){

	tab1 = document.getElementById(id1)
	tab2 = document.getElementById(id2)
	tab1_b = document.getElementById(id1+'_b')
	tab2_b = document.getElementById(id2+'_b')
	
	tab1.style.display = 'block';
	tab2.style.display = 'none';
	
	tab1_b.className = 'tab_button2_active'
	tab2_b.className = 'tab_button1'
}

function tab_menuy(id1, id2){

	tab1 = document.getElementById(id1)
	tab2 = document.getElementById(id2)
	tab1_b = document.getElementById(id1+'_b')
	tab2_b = document.getElementById(id2+'_b')
	
	tab1.style.display = 'block';
	tab2.style.display = 'none';

	tab2_b.className = 'tab_button2'
	tab1_b.className = 'tab_button1_active'
}