function rollon() {
	if (window.event.srcElement.className == "ebene_1") window.event.srcElement.className = "fett_1";
	if (window.event.srcElement.className == "ebene_2") window.event.srcElement.className = "fett_2";
	if (window.event.srcElement.className == "ebene_3") window.event.srcElement.className = "fett_3";
	if (window.event.srcElement.className == "oben_l")  window.event.srcElement.className = "oben_f";
	if (window.event.srcElement.className == "gruen")   window.event.srcElement.className = "gruen_f";
	if (window.event.srcElement.className == "rot")     window.event.srcElement.className = "rot_f";
}
function rolloff() {
	if (window.event.srcElement.className == "fett_1") window.event.srcElement.className = "ebene_1";
	if (window.event.srcElement.className == "fett_2") window.event.srcElement.className = "ebene_2";
	if (window.event.srcElement.className == "fett_3") window.event.srcElement.className = "ebene_3";
	if (window.event.srcElement.className == "oben_f") window.event.srcElement.className = "oben_l";
	if (window.event.srcElement.className == "gruen_f")window.event.srcElement.className = "gruen";
	if (window.event.srcElement.className == "rot_f")  window.event.srcElement.className = "rot";
}
document.onmouseover = rollon;
document.onmouseout = rolloff;