function go_letter(q_visible){
	document.getElementById('lexicon_a').style.visibility = 'hidden';
	document.getElementById('lexicon_b').style.visibility = 'hidden'; 
	document.getElementById('lexicon_c').style.visibility = 'hidden'; 
	document.getElementById('lexicon_d').style.visibility = 'hidden'; 
	document.getElementById('lexicon_e').style.visibility = 'hidden'; 
	document.getElementById('lexicon_f').style.visibility = 'hidden'; 
	document.getElementById('lexicon_g').style.visibility = 'hidden'; 
	document.getElementById('lexicon_h').style.visibility = 'hidden'; 
	document.getElementById('lexicon_ij').style.visibility ='hidden'; 
	document.getElementById('lexicon_k').style.visibility = 'hidden'; 
	document.getElementById('lexicon_l').style.visibility = 'hidden'; 
	document.getElementById('lexicon_m').style.visibility = 'hidden'; 
	document.getElementById('lexicon_no').style.visibility = 'hidden'; 
	document.getElementById('lexicon_p').style.visibility = 'hidden'; 
	document.getElementById('lexicon_qr').style.visibility = 'hidden'; 
	document.getElementById('lexicon_s').style.visibility = 'hidden'; 
	document.getElementById('lexicon_t').style.visibility = 'hidden'; 
	document.getElementById('lexicon_u').style.visibility ='hidden'; 
	document.getElementById('lexicon_vw').style.visibility = 'hidden'; 
	document.getElementById('lexicon_xy').style.visibility ='hidden'; 
	document.getElementById('lexicon_z').style.visibility = 'hidden'; 
	
	
	document.getElementById(q_visible).style.visibility = 'visible';
	 
}