function showMyDiv() {
if (window.location.href == "http://atimco.dk/" || window.location.href == "http://atimco.dk/Default.aspx?kat=100" || window.location.href == "http://www.atimco.dk/Default.aspx?kat=100" || window.location.href == "http://www.atimco.dk/") { 
document.getElementById("headercontainer").style.display="block";
}
else {
document.getElementById("headercontainer").style.display="none";
}
}