function preload_images() {
	gastro_submenu_home_on = new Image();
	gastro_submenu_home_on.src = "images/gastro_home_on.gif";
	gastro_submenu_home_off = new Image();
	gastro_submenu_home_off.src = "images/gastro_home_off.gif";

	gastro_submenu_kontakt_on = new Image();
	gastro_submenu_kontakt_on.src = "images/gastro_kontakt_on.gif";
	gastro_submenu_kontakt_off = new Image();
	gastro_submenu_kontakt_off.src = "images/gastro_kontakt_off.gif";

	gastro_submenu_hilfe_on = new Image();
	gastro_submenu_hilfe_on.src = "images/gastro_hilfe_on.gif";
	gastro_submenu_hilfe_off = new Image();
	gastro_submenu_hilfe_off.src = "images/gastro_hilfe_off.gif";

	gastro_submenu_logoff_on = new Image();
	gastro_submenu_logoff_on.src = "images/logoff_on.gif";
	gastro_submenu_logoff_off = new Image();
	gastro_submenu_logoff_off.src = "images/logoff_off.gif";
}

function img_act(imgName)
{
	imgOn = eval(imgName + "_on.src");
	document[imgName].src = imgOn;
}

function img_inact(imgName)
{
	imgOff = eval(imgName + "_off.src");
	document[imgName].src = imgOff;
}

preload_images();