function aff(objet){ 
if(document.getElementById(objet).style.display == "block") { 
document.getElementById(objet).style.display = "none"; } else { 
document.getElementById(objet).style.display = "block"; } 
} 

function a1()
{aff('a1');}
function b1()
{aff('b1');}
function c1()
{aff('c1');}
function c2()
{aff('c2');}
function c3()
{aff('c3');}
function i1()
{aff('i1');}
function i2()
{aff('i2');}
function i3()
{aff('i3');}
function m1()
{aff('m1');}
function p1()
{aff('p1');}
function p2()
{aff('p2');}
function p3()
{aff('p3');}
function p4()
{aff('p4');}
function t1()
{aff('t1');}