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;
}
function MM_findObj(n, d) { //v4.0
  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);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

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_changeProp(objName,x,theProp,theValue) { //v6.0
  var obj = MM_findObj(objName);
  if (obj && (theProp.indexOf("style.")==-1 || obj.style)){
    if (theValue == true || theValue == false)
      eval("obj."+theProp+"="+theValue);
    else eval("obj."+theProp+"='"+theValue+"'");
  }
}

var oAnimate    = document.getElementById("ID_ANIMATE");

var nWidth      = oAnimate.offsetWidth;
var nHeight     = oAnimate.offsetHeight;
var nFSize      = 9;
var nCount      = 30;
var nMaxSpeed   = 4;
var strFlakeURL = "img/snowflake.gif";

// --

var aoFlakes    = new Array(nCount);

// --

function UpdateFlakePos(nNum)
{
    var oImg = aoFlakes[nNum];
    oImg.style.top = oImg.m_nY.toString(10) + "px";
    oImg.style.left = oImg.m_nX.toString(10) + "px";
}

function ResetFlake(nNum, bRandY)
{
    var oImg = aoFlakes[nNum];

    oImg.m_nX           = Math.ceil(Math.random() * nWidth);
    oImg.m_nY           = bRandY ? Math.ceil(Math.random() * nHeight) : -nFSize;
    oImg.m_nSpeed       = Math.ceil(Math.random() * nMaxSpeed) + 1;
}

function OnTimer()
{
    for(var i = 0; i < nCount; i++)
    {
        var oImg = aoFlakes[i];

        oImg.m_nX += Math.ceil(Math.random() * 3 - 2);
        oImg.m_nY += oImg.m_nSpeed;

        if(oImg.m_nY > nHeight)
            ResetFlake(i, false);

        UpdateFlakePos(i);
    }
}

// --

for(var i = 0; i < nCount; i++)
{
    var oImg = document.createElement("IMG");

    oImg.src = strFlakeURL;
    oAnimate.appendChild(oImg);

    aoFlakes[i] = oImg;

    ResetFlake(i, true);
    UpdateFlakePos(i);
}

window.setInterval(OnTimer, 50);