var currentTab = "trDetails";
   
  function showTab(id)
  {
    var currentLI = document.getElementById(currentTab + "_li");
    if (currentLI != null)
    {
        currentLI.style.backgroundImage = "";
    }
    
    var currentA = document.getElementById(currentTab + "_a");
    if (currentA != null)
    {
        currentA.style.backgroundImage = "";
        currentA.style.color = "";
    }
        
    var currentDiv = document.getElementById(currentTab);
    if (currentDiv != null)
    {
        currentDiv.style.display = "none";
    }
    
    var newLI = document.getElementById(id + "_li");
    if (newLI != null)
    {
        newLI.style.backgroundImage = "url('/images/tableft_on.gif')";
    }
    
    
    var newA = document.getElementById(id + "_a");
    if (newA != null)
    {
        newA.style.backgroundImage = "url('/images/tabright_on.gif')"; 
        newA.style.color = "#ffffff";
    }    
    
    var newImgDiv = document.getElementById(id);
    if (newImgDiv != null)
    {
        newImgDiv.style.display = "block";
    }
    currentTab = id;
    return false;
 }