var len = 7;


function initFadeIn(contentId) {
   content = document.getElementById(contentId);
   setOpacity(content, 0);
   content.style.visibility = "visible";
   fadeIn(contentId,0);
}
function fadeIn(objId,opacity) {
   if (document.getElementById) {
      obj = document.getElementById(objId);
      if (opacity <= 100) {
         setOpacity(obj, opacity);
         opacity += 10;
         window.setTimeout("fadeIn('"+objId+"',"+opacity+")", 100);
      }
   }
}
function setOpacity(obj, opacity) {
   opacity = (opacity == 100)?99.999:opacity;
   // IE/Win
   obj.style.filter = "alpha(opacity:"+opacity+")";
   // Safari<1.2, Konqueror
   obj.style.KHTMLOpacity = opacity/100;
   // Older Mozilla and Firefox
   obj.style.MozOpacity = opacity/100;
   // Safari 1.2, newer Firefox and Mozilla, CSS3
   obj.style.opacity = opacity/100;
   // IE/Win
   obj.style.filter = "alpha(opacity="+opacity+")";
}

function ShowContent(i) {
   for(var b=0; b<len; b++) {
      document.getElementById('content'+b).style.display = "none";
      document.getElementById('menu'+b).style.fontWeight ="normal";
   //   setOpacity(document.getElementById('content'+b),0);
   }
   document.getElementById('content'+i).style.display = "block";
   document.getElementById('menu'+i).style.fontWeight ="bold";
 //  initFadeIn('content'+i);
}