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 changebg(idname, bgsrc) {
document.getElementById(idname).style.backgroundImage = bgsrc;
}

function changecolor(idname, colorsrc) {
document.getElementById(idname).style.color = colorsrc;
}