function setVisibility(rowName) {
	// Tabellenzelle ermitteln

	var actualVisibility=document.getElementById(rowName).style.visibility;

	if(actualVisibility=='' || actualVisibility=='hidden') {
		document.getElementById(rowName).style.visibility = "visible";
		document.getElementById(rowName).style.display = "";
	} else {
		document.getElementById(rowName).style.visibility = "hidden";
		document.getElementById(rowName).style.display = "none";
	}

}

function swapImage(ID) {

    var image_in = new Image();
    image_in.src = "gifs/magnifier_zoom_in.png";
    var image_out = new Image();
    image_out.src = "gifs/magnifier_zoom_out.png";

    var actualVisibility=document.images[ID].src;

    if(actualVisibility==image_out.src) {
        document.images[ID].src = image_in.src;
    } else {
        document.images[ID].src = image_out.src;
    }

}