var is_unsaved_changes = false;

function set_unsaved_changes(text)
{
	if (!is_unsaved_changes)
	{
		is_unsaved_changes = true;
		if (text == null) text = "Warning! You have unsaved changes on this page! If you wish to save your changes, please press Cancel now and use the Save button.";
		window.onbeforeunload = function() { return text; }
	}
}

function clear_unsaved_changes(text)
{
	is_unsaved_changes = false;
	window.onbeforeunload = null;
}

function set_view_option(name, value)
{
	var values = { 'true':"on", 'false':"off" };
	if (values[value] != null)
		value = values[value]
	new Request({"url":"/_shared/view-options/"}).post(new Hash().set(name,value));
	return false;
}

function open_popup(link)
{
	window.open(link.href,null,"status=no, resizable=yes, location=no, menubar=no,width=430,height=360,toolbar=no,screenX=100, screenY=100, scrollbars=1");
}