function show(str)
{

for ( i = 1 ; i < 7 ; i++ )
{
document.getElementById("a0"+i).style.display='none';
}
document.getElementById(str).style.display='block';
}
function hidden()
{
for ( i = 1 ; i < 7 ; i++ )
{
document.getElementById("a0"+i).style.display='none';
}
}


	function my_getbyid(id)
    {
       itm = null;
       if (document.getElementById)
       {
          itm = document.getElementById(id);
       }
       else if (document.all)
       {
          itm = document.all[id];
       }
       else if (document.layers)
       {
          itm = document.layers[id];
       }
       
       return itm;
    }