function schaltan(idname) { 
document.getElementById(idname).style.display = "block"; 
} 

function schaltaus(idname) { 
document.getElementById(idname).style.display = "none"; 
} 

function changepic(idname, picsrc) {
document.getElementById(idname).src = picsrc;
}

function changetext(idname, textsrc) {
document.getElementById(idname).innerHTML  = textsrc;
}

function ladeBild() {
    var now = new Date();
    if (document.images) {
        document.images.guitar.src = 'http://studio-vier.de/wp-content/themes/klaus/images/header.gif?' + now.getTime();
    }
}