function initBanner(){
   var bannercontainer = document.getElementById("bannercontainer");
   bannercontainer.style.position = "absolute";
   bannercontainer.style.display = "block";
   bannercontainer.style.overflow = "hidden";
   bannercontainer.style.height = "90px";
}
function showBanner(){
   document.getElementById("bannercontainer").style.height = "750px";
}
function hideBanner(){
   document.getElementById("bannercontainer").style.height = "90px";
}