if (document.images) {
	navsrcho = new Image();  navsrcho.src = "/ptorico/images/spsearcho.gif";
	navpubo = new Image();  navpubo.src = "/ptorico/images/sppubo.gif";
	navsrch = new Image();   navsrch.src = "/ptorico/images/spsearch.gif";
	navpub = new Image();   navpub.src = "/ptorico/images/sppub.gif";
}

function imgOn(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + "o.src");
	}
}

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