<script>
    var pictureSrc ="http://vnvista.com/forums/jscripts/snow2.gif"; //the location of the snowflakes
    var pictureWidth = 20; //the width of the snowflakes
    var pictureHeight = 20; //the height of the snowflakes
    var numFlakes = 10; //the number of snowflakes
    var downSpeed = 0.01; //the falling speed of snowflakes (portion of screen per 100 ms)
    var lrFlakes = 10; //the speed that the snowflakes should swing from side to side


    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"></layer>');
    } else {
    document.write('<div style="position:absolute;" id="snFlkDiv'+x+'"><img src="'+pictureSrc+'" height="'+pictureHeight+'" width="'+pictureWidth+'" alt="*" border="0"></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( !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;
    }

    window.setInterval('flakeFall();',100);</script>