lo_go = new Image;
	lo_go.src = "../gif/lo_weiter.gif";
	hi_go = new Image;
	hi_go.src = "../gif/hi_weiter.gif";

	lo_goweg = new Image;
	lo_goweg.src = "../gif/lo_zuruck.gif";
	hi_goweg = new Image;
	hi_goweg.src = "../gif/hi_zuruck.gif";

	function changepic (picObj, action)
	{
		if (picObj)(picObj.name.substr(picObj.name.length - 2, picObj.name.length));
		{
			picObj.src = eval(action+"_"+picObj.name).src;
			if (action == 'hi')
			{
				picObj.src = eval('hi_' + picObj.name).src;
				picObj = '';
			}
			if (action == 'lo')
			{
				picObj.src = eval('lo_' + picObj.name).src;
				picObj = '';
			}
		}
		return;
	}