function MM_findObj(n, d) { //v3.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); return x;
}

/* Functions that swaps images. */
function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; 
  document.MM_sr=new Array; 
  for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null)
     {
       document.MM_sr[j++]=x; 
       if(!x.oSrc) 
         x.oSrc=x.src; 
       x.src=a[i+2];
     }
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

/* Functions that swaps down images. */
function MM_nbGroup(event, grpName) 
{ //v3.0
  var i,img,nbArr,args=MM_nbGroup.arguments;
  if (event == "init" && args.length > 2) {
    if ((img = MM_findObj(args[2])) != null && !img.MM_init) {
      img.MM_init = true; img.MM_up = args[3]; img.MM_dn = img.src;
      if ((nbArr = document[grpName]) == null) nbArr = document[grpName] = new Array();
      nbArr[nbArr.length] = img;
      for (i=4; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) {
        if (!img.MM_up) img.MM_up = img.src;
        img.src = img.MM_dn = args[i+1];
        nbArr[nbArr.length] = img;
    } }
  } else if (event == "over") {
    document.MM_nbOver = nbArr = new Array();
    for (i=1; i < args.length-1; i+=3) 
      if ((img = MM_findObj(args[i])) != null) 
      {

      if (!img.MM_up) 
      {
        img.MM_up = img.src;
      }
      img.src = (img.MM_dn && args[i+2]) ? args[i+2] : args[i+1];
      nbArr[nbArr.length] = img;
    }
  } else if (event == "out" ) {
    for (i=0; i < document.MM_nbOver.length; i++) {
      img = document.MM_nbOver[i]; img.src = (img.MM_dn) ? img.MM_dn : img.MM_up; }
  } else if (event == "down") {
    if ((nbArr = document[grpName]) != null)
      for (i=0; i < nbArr.length; i++) { img=nbArr[i]; img.src = img.MM_up; img.MM_dn = 0; }
    document[grpName] = nbArr = new Array();
    for (i=2; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) {
      if (!img.MM_up) img.MM_up = img.src;
      img.src = img.MM_dn = args[i+1];
      nbArr[nbArr.length] = img;
  } }
}

/* Functions that handle preload. */
function MM_preloadImages() 
{ 
  var d=document; 
  if(d.images)
  { 
    if(!d.MM_p) 
      d.MM_p=new Array();

    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; 

    for(i=0; i<a.length; i++)
      if (a[i].indexOf("#")!=0)
      { 
        d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];
      }
  }
}

function slv_init(section)
{
  // make sure if section is valid
  switch (section)
  {
    case "Collections": section = "collections";
      setMenu(section);
      setHeaderTitle(section); 
      randomImages(section);
      break;
    case "Catalogues & Databases": section = "catalogues";
      setMenu(section);
      setHeaderTitle(section); 
      randomImages(section);
      break;
    case "Services": section = "services";
      setMenu(section);
      setHeaderTitle(section); 
      randomImages(section);
      break;
    case "About Us": section = "aboutus";
      setMenu(section);
      setHeaderTitle(section); 
      randomImages(section);
      break;
    default: return false;           
  }
}

function setMenu(section)
{
  var target = "menu_" + section;
  if (document.images(target).src)
  {
    var src = document.images(target).src; 
    var offset = src.lastIndexOf("/");
  
    document.images(target).src = src.substring(0, offset) + "/menu_" + section + "_mouse_over.gif";
  }
}

function setHeaderTitle(section)
{
  images = new Array();
  images["collections"] = "/header_title_" + section + ".jpg";
  images["catalogues"] = "/header_title_" + section + ".gif";
  images["services"] = "/header_title_" + section + ".jpg";
  images["aboutus"] = "/header_title_" + section + ".jpg";
 
  document.header_title.src += images[section];
  document.header_title.style.visibility = "visible";
}

function randomImages(dir)
{
  // check cookie if the new image is required.
  if (!getCookie("visited"))
  { 
    // load images
    images = new Array(dir+"1.jpg", dir+"2.jpg", dir+"3.jpg", dir+"4.jpg", dir+"5.jpg", dir+"6.jpg");

    // choose a random image
    var nextImage;
    nextImage = Math.round(Math.random()*10)%6;

    // set the new image
    document.header_image.src += "/header\/" + dir +"/" + images[nextImage];       
    document.header_image.style.visibility = "visible"; 

    // set the cookie so that the image would not change for 5 mins
    var now = new Date();
    var expire = new Date();
    expire.setTime(now.getTime() + 60*5);
    //document.cookie = "visited=yes;" + "expires=" + expire.toGMTString();
    document.cookie = "visited=yes;" + "expires=" + now.toGMTString();
  }
}

function getCookie(name)
{
  if (document.cookie.length > 0)
  {
    search = name + "=";
    offset = document.cookie.indexOf(name+"=");
    // if the name is found
    if (offset != -1)
    {
      // set index of beginning of value                              
      offset += search.length;
      // set index of end of cookie value                              
      end = document.cookie.indexOf(";", offset);

      if (end == -1)                                         
        end = document.cookie.length;
      
      value = unescape(document.cookie.substring(offset, end));
      
      return value;
    }
  }

  return false;
}