function hdr_ref(object)
{
if (document.getElementById)
{
return document.getElementById(object);
}
else if (document.all)
{
return eval('document.all.' + object);
}
else
{
return false;
}
}

function hdr_expand(object)
{
var object = hdr_ref(object);

if( !object.style )
{
return false;
}
else
{
object.style.display = '';
}

if (window.event)
{
window.event.cancelBubble = true;
}
}

function hdr_contract(object)
{
var object = hdr_ref(object);

if( !object.style )
{
return false;
}
else
{
object.style.display = 'none';
}

if (window.event)
{
window.event.cancelBubble = true;
}
}

function hdr_toggle(object, open_close, open_icon, close_icon)
{
var object = hdr_ref(object);
var icone = hdr_ref(open_close);

if( !object.style )
{
return false;
}

if( object.style.display == 'none' )
{
object.style.display = '';
icone.src = close_icon;
}
else
{
object.style.display = 'none';
icone.src = open_icon;
}
}