function $(name)
{
  return document.getElementById(name)
}

function show(obj)
{
  if(obj != null)
    obj.style.display = "block";
}

function hide(obj)
{
  if(obj != null)
    obj.style.display = "none";
}

function enable(obj)
{
  if(obj != null)
    obj.disabled = false;
}
function disable(obj)
{
  if(obj != null)
    obj.disabled = true;
}

function hidediv(divid) 
{
	if (document.getElementById) 
	{ 
		// DOM3 = IE5, NS6
		document.getElementById(divid).style.visibility = 'hidden';
	}
	else 
	{
		if (document.layers) 
		{ // Netscape 4
		document.hideShow.visibility = 'hidden';
		}
		else 
		{ // IE 4
		document.all.hideShow.style.visibility = 'hidden';
		}
	}
}

function showdiv(divid) 	
{
	if (document.getElementById) 
	{ // DOM3 = IE5, NS6
		document.getElementById(divid).style.visibility = 'visible';
	}
	else 
	{
		if (document.layers) 
		{ // Netscape 4
			document.hideShow.visibility = 'visible';
		}
		else 
		{ // IE 4
			document.all.hideShow.style.visibility = 'visible';
		}
	}
}