function toggle1(div)
{
var option=['contact', 'about'];
for(var i=0; i<option.length; i++)
{ obj=document.getElementById(option[i]);
obj.style.display=(option[i]==div) && !(obj.style.display=="block")? "" : "none"; }
}

function toggle(div)
{
var option=['photo1','photo2','photo3','photo4','photo5','photo6','photo7','photo8','photo9','photo10','photo11','photo12'];
for(var i=0; i<option.length; i++)
{ obj=document.getElementById(option[i]);
obj.style.display=(option[i]==div) && !(obj.style.display=="block")? "" : "none"; }
}