var pictureSrc = 'http://www.vsemnazlo.ru/images/vsemnazlo/leto/1.gif';    //the location of the snowflakes
var pictureWidth = 28;            //the width of the snowflakes
var pictureHeight = 28;           //the height of the snowflakes
var numFlakes = 7;               //the number of snowflakes
var downSpeed = 0.002;            //the falling speed of snowflakes (portion of screen per 100 ms)
var lrFlakes = 5;                 //the speed that the snowflakes should swing from side to side
                                  //relative to distance fallen (swing increases with fewer
                                  //snowflakes to fill available space)
var snowEnabled = true;
var intervalID = 0;
 
/****** Do not edit below this line unless you know what you are doing ******/
 
//safety checks. Browsers will hang if this is wrong. If other values are wrong there will just be errors
if( typeof( numFlakes ) != 'number' || Math.round( numFlakes ) != numFlakes || numFlakes < 1 ) { numFlakes = 10; }
 
//draw the snowflakes
for( var x = 0; x < numFlakes; x++ ) {
 if( document.layers ) { //releave NS4 bug
  document.write('<layer id="snFlkDiv'+x+'"><img src="'+pictureSrc+'" height="'+pictureHeight+'" width="'+pictureWidth+'" alt="*" border="0" onclick="StopSnow()"></layer>');
 } else {
  document.write('<div style="position:absolute;" id="snFlkDiv'+x+'"><img src="'+pictureSrc+'" height="'+pictureHeight+'" width="'+pictureWidth+'" alt="*" border="0" onclick="StopSnow()"></div>');
 }
}
 
//calculate initial positions (in portions of browser window size)
var xcoords = new Array(), ycoords = new Array(), snFlkTemp;
for( var x = 0; x < numFlakes; x++ ) {
 xcoords[x] = ( x + 1 ) / ( numFlakes + 1 );
 do { snFlkTemp = Math.round( ( numFlakes - 1 ) * Math.random() );
 } while( typeof( ycoords[snFlkTemp] ) == 'number' );
 ycoords[snFlkTemp] = x / numFlakes;
}
 
//now animate
function flakeFall() {
 if( !snowEnabled )
 {
  window.clearInterval(intervalID);
  for( var x = 0; x < numFlakes; x++ ) 
  {
   var divRef = getRefToDivNest('snFlkDiv'+x); if( !divRef ) { return; }
   if( divRef.style ) { divRef = divRef.style; }
   divRef.visibility = 'hidden';
  }
  return;
 }
 if( !getRefToDivNest('snFlkDiv0') ) { return; }
 var scrWidth = 0, scrHeight = 0, scrollHeight = 0, scrollWidth = 0;
 //find screen settings for all variations. doing this every time allows for resizing and scrolling
 if( typeof( window.innerWidth ) == 'number' ) { scrWidth = window.innerWidth; scrHeight = window.innerHeight; } else {
  if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
   scrWidth = document.documentElement.clientWidth; scrHeight = document.documentElement.clientHeight; } else {
   if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    scrWidth = document.body.clientWidth; scrHeight = document.body.clientHeight; } } }
 if( typeof( window.pageYOffset ) == 'number' ) { scrollHeight = pageYOffset; scrollWidth = pageXOffset; } else {
  if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) { scrollHeight = document.body.scrollTop; scrollWidth = document.body.scrollLeft; } else {
   if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) { scrollHeight = document.documentElement.scrollTop; scrollWidth = document.documentElement.scrollLeft; } }
 }
 //move the snowflakes to their new position
 for( var x = 0; x < numFlakes; x++ ) {
  if( ycoords[x] * scrHeight > scrHeight - pictureHeight ) { ycoords[x] = 0; }
  var divRef = getRefToDivNest('snFlkDiv'+x); if( !divRef ) { return; }
  if( divRef.style ) { divRef = divRef.style; } var oPix = document.childNodes ? 'px' : 0;
  divRef.top = ( Math.round( ycoords[x] * scrHeight ) + scrollHeight ) + oPix;
  divRef.left = ( Math.round( ( ( xcoords[x] * scrWidth ) - ( pictureWidth / 2 ) ) + ( ( scrWidth / ( ( numFlakes + 1 ) * 4 ) ) * ( Math.sin( lrFlakes * ycoords[x] ) - Math.sin( 3 * lrFlakes * ycoords[x] ) ) ) ) + scrollWidth ) + oPix;
  ycoords[x] += downSpeed;
 }
}
 
//DHTML handlers
function getRefToDivNest(divName) {
 if( document.layers ) { return document.layers[divName]; } //NS4
 if( document[divName] ) { return document[divName]; } //NS4 also
 if( document.getElementById ) { return document.getElementById(divName); } //DOM (IE5+, NS6+, Mozilla0.9+, Opera)
 if( document.all ) { return document.all[divName]; } //Proprietary DOM - IE4
 return false;
}
 
function StopSnow()
{
 snowEnabled = false;
}
 
intervalID = window.setInterval('flakeFall();',40);