function slide01()
{
var obj=document.getElementById('slide01');
if(obj.style.display=='none')
obj.style.display='block';
else
obj.style.display='none';
}

function slide02()
{
var obj=document.getElementById('slide02');
if(obj.style.display=='none')
obj.style.display='block';
else
obj.style.display='none';
}

function slide03()
{
var obj=document.getElementById('slide03');
if(obj.style.display=='none')
obj.style.display='block';
else
obj.style.display='none';
}

function slide04()
{
var obj=document.getElementById('slide04');
if(obj.style.display=='none')
obj.style.display='block';
else
obj.style.display='none';
}