var NS = (document.layers) ? 1:0;
var IE = (document.all) ? 1:0;
var W3C = (document.getElementById) ? 1:0;

var funcimg = new Array('pfeil_l', 'pfeil_r', 'pfeil_o', 'pfeil_u', 'pfeil3_r', 'print', 'lupe');
var imgs = new Array;
var imgson = new Array;
for (i=0; i<funcimg.length;i++) {
    imgs[funcimg[i]] = new Image();
    imgs[funcimg[i]].src = '/images/'+funcimg[i]+".gif";
    imgson[funcimg[i]] = new Image();
    imgson[funcimg[i]].src = '/images/'+funcimg[i]+"_r.gif";
}

function showI(layer,name,src) {
    if (NS) {
        document.layers[layer].document.images[name].src = imgson[src].src;
    } else if (W3C) {
        document.images[name].src = imgson[src].src;
    }
}
function hideI(layer,name,src) {
    if (NS) {
        document.layers[layer].document.images[name].src = imgs[src].src;
    } else if (W3C) {
        document.images[name].src = imgs[src].src;
    }
}