<script type="text/javascript">
<!-- Begin
var no = 25; // количество снежинок
var speed = 10; // скорость падения снежинок
var snowflake = "адрес_снежинки";

var ns4up = (document.layers) ? 1 : 0; // browser sniffer
var ie4up = (document.all) ? 1 : 0;
var dx, xp, yp; // coordinate and position variables
var am, stx, sty; // amplitude and step variables
var i, doc_width = 800, doc_height = 600;
if (ns4up) {
doc_width = self.innerWidth;
doc_height = self.innerHeight;
} else if (ie4up) {
doc_width = document.body.clientWidth;
doc_height = document.body.clientHeight;
}
dx = new Array();
xp = new Array();
yp = new Array();
am = new Array();
stx = new Array();
sty = new Array();
for (i = 0; i < no; ++ i) { 
dx[i] = 0; // set coordinate variables
xp[i] = Math.random()*(doc_width-50); // set position variables
yp[i] = Math.random()*doc_height;
am[i] = Math.random()*20; // set amplitude variables
stx[i] = 0.02 + Math.random()/10; // set step variables
sty[i] = 0.7 + Math.random(); // set step variables
if (ns4up) { // set layers
if (i == 0) {
document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
document.write("top=\"15\" visibility=\"show\"><img src=\"");
document.write(snowflake + "\" border=\"0\"></layer>");
} else {
document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
document.write("top=\"15\" visibility=\"show\"><img src=\"");
document.write(snowflake + "\" border=\"0\"></layer>");
}
} else if (ie4up) {
if (i == 0) {
document.write("<div id=\"dot"+ i +"\" style=\"position: ");
document.write("absolute; z-index: "+ i +"; visibility: ");
document.write("visible; top: 15px; left: 15px;\" /><img src=\"");
document.write(snowflake + "\" border=\"0\"></div>");
} else {
document.write("<div id=\"dot"+ i +"\" style=\"position: ");
document.write("absolute; z-index: "+ i +"; visibility: ");
document.write("visible; top: 15px; left: 15px;\"><img src=\"");
document.write(snowflake + "\" border=\"0\" /></div>");
}
}
}
function snowNS() { // Netscape main animation function
for (i = 0; i < no; ++ i) { // iterate for every dot
yp[i] += sty[i];
if (yp[i] > doc_height-50) {
xp[i] = Math.random()*(doc_width-am[i]-30);
yp[i] = 0;
stx[i] = 0.02 + Math.random()/10;
sty[i] = 0.7 + Math.random();
doc_width = self.innerWidth;
doc_height = self.innerHeight;
}
dx[i] += stx[i];
document.layers["dot"+i].top = yp[i];
document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]);
}
setTimeout("snowNS()", speed);
}
function snowIE() { // IE main animation function
for (i = 0; i < no; ++ i) { // iterate for every dot
yp[i] += sty[i];
if (yp[i] > doc_height-50) {
xp[i] = Math.random()*(doc_width-am[i]-30);
yp[i] = 0;
stx[i] = 0.02 + Math.random()/10;
sty[i] = 0.7 + Math.random();
doc_width = document.body.clientWidth;
doc_height = document.body.clientHeight;
}
dx[i] += stx[i];
document.all["dot"+i].style.pixelTop = yp[i];
document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);
}
setTimeout("snowIE()", speed);
}
if (ns4up) {
snowNS();
} else if (ie4up) {
snowIE();
}
// End -->
</script>
Вместо Адрес_снежинки - вписать адрес той картинки, которая будет играть роль снежинок

<script type="text/javascript">
var a =document.getElementById('pun-status').innerHTML
if (a.indexOf("Гость")!=-1)
{document.getElementById('pun-status').innerHTML="<div class='formal'>"+"<form id='login'"+" class='container'"+" method='post'"+" action='http://testingmyforum1.4bb.ru/login.php?action=in'"+" onsubmit='return my_form(this)'>"+"<fieldset><legend><span>Введите ваше имя и пароль ниже</span></legend><div class='fs-box inline'>"+"<input type='hidden'"+" name='form_sent'"+" value='1' />"+"<input type='hidden'"+" name='redirect_url'"+" value='index.php' />"+"<p class='inputfield required'>"+"<label for='fld1'>Имя <em>(Обязательно)</em></label><br />"+"<span class='input'>"+"<input type='text'"+" id='fld1'"+" name='req_username'"+" size='25'"+" maxlength='25' /></span></p>"+"<p class='inputfield required'>"+"<label for='fld2'>Пароль <em>(Обязательно)</em></label><br />"+"<span class='input'>"+"<input type='password'"+" id='fld2'"+" name='req_password'"+" size='16'"+" maxlength='16' /></span></p></div></fieldset>"+"<p class='formsubmit'>"+"<input type='submit'"+" class='button'"+" name='login'"+" value='Войти' /></p></form></div>"}
function my_form(the_form)
{
var element_names = new Object()
    element_names["req_username"] = "Имя"
    element_names["req_password"] = "Пароль"

if (document.all || document.getElementById)
{
    for (i = 0; i < the_form.length; ++i)
    {
    var elem = the_form.elements[i]
    if (elem.name && elem.name.substring(0, 4) == "req_")
    {
        if (elem.type && (elem.type=="text" || elem.type=="textarea" || elem.type=="password" || elem.type=="file") && elem.value=='')
        {
        alert("\"" + element_names[elem.name] + "\" это поле обязательно для заполнения в этой форме.")
        elem.focus()
        return false
        }
    }
    }
}

return true
}
</script>