function up()
{
	document.getElementById('test').innerHTML = '<iframe id="datamain" name="datamain" src="external1.htm" width="170px" height="180px" marginwidth="0" marginheight="0" frameborder="0" scrolling="no"></iframe>'
}

function down()
{
	document.getElementById('test').innerHTML = '<iframe id="datamain" name="datamain" src="external.htm" width="170px" height="180px" marginwidth="0" marginheight="0" frameborder="0" scrolling="no"></iframe>'
}