document.body.style.marginTop = "40px"; 
document.body.style.position = "relative";
document.body.style.border = "1px solid #e3e3e3";
document.body.style.backgroundPosition = "0 40px"; 

div = document.createElement('div');

div.id = 'TL_iframe';
if (document.body.firstChild){
	document.body.insertBefore(div, document.body.firstChild);
} 
else {
	document.body.appendChild(div);
}

document.getElementById("TL_iframe").style.marginTop = "-41px";
document.getElementById("TL_iframe").innerHTML = "<iframe src=\"http:\/\/www.asta.uni-tuebingen.de\/linkleiste\/header.html\" width=\"100%\" height=\"40px\" frameborder=\"0\" scrolling=\"no\"><\/iframe>";