function getObj(name)
{
    if (document.getElementById)
    {
	this.obj = document.getElementById(name);
	this.style = document.getElementById(name).style;
    }
    else if (document.all)
    {
	this.obj = document.all[name];
	this.style = document.all[name].style;
    }
    else if (document.layers)
    {
	this.obj = document.layers[name];
	this.style = document.layers[name];
    }
}

toggleVis = function(layer_)
{
    var element_ = new getObj(layer_);

    if (element_.style.display == 'block')
		element_.style.display = 'none';
    else
		element_.style.display = 'block';
}