function changeSrc(id,state)
{
	if (state == 'on')
	{
		document.getElementById(id).src="images/"+id+"_on.gif";
	}
	else
	{
		document.getElementById(id).src="images/"+id+".gif";
	}
}
function input_hint(obj,hint)
{
	if (obj.value == hint)
	{
		obj.value = '';
	}
	else if (obj.value == '')
	{
		obj.value = hint;
	}
}