function imgChangeOn(name) {
    img = eval('document.images.'+name);
    imgsrc = img.src.replace('_a.gif','.gif');
    img.src = imgsrc.replace('.gif','_a.gif');
}
function imgChangeOff(name) {
    img = eval('document.images.'+name);
    img.src = img.src.replace('_a.gif','.gif');
}

function spacer(flag){
	if (document.layers || flag=="all") {
		document.write ('<font size=1>');
		for (n=0;n<30;n++) {
		document.write ('&nbsp;&nbsp; ');
		}
		document.write ('</font>');
	}
}
function mailto(str) {
    var mailto='';
    for (n=0;s=str.substring(n*2,2*n+2);n++) {
        mailto+= unescape('%'+s) ;
    }
    location.href="mailto:"+ mailto;
}

function changeBackgroundImage(color)
{  
    switch (color) {
    
    case 1:
        imgurl  = "img/bg.gif";
        break;

    case 2:
        imgurl  = "img/blau.gif";
        break;

    case 3:
        imgurl  = "img/braun.gif";
        break;
    
    case 4:
        imgurl  = "img/grau.gif";
        break;
    
    default:
        imgurl  = "img/bg.gif";
        break;
   
    } 
    document.getElementById("body").style.backgroundImage = "url("+imgurl+")";
}