SCRIPT<script
language="JavaScript1.2">
//Configure below to change
URL path to the snow image
var
snowsrc="pallinabianca.gif"
// Configure below to change
number of snow to render
var no = 10;
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\" top=\"15\"
visibility=\"show\"><a
href=\"http://dynamicdrive.com/\"><img src='"+snowsrc+"'
border=\"0\"></a></layer>");
} else {
document.write("<layer
name=\"dot"+ i +"\" left=\"15\" top=\"15\"
visibility=\"show\"><img src='"+snowsrc+"'
border=\"0\"></layer>");
}
} else if (ie4up) {
if (i == 0) {
document.write("<div
id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i
+"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><a
href=\"http://dynamicdrive.com\"><img src='"+snowsrc+"'
border=\"0\"></a></div>");
} else {
document.write("<div
id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i
+"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img
src='"+snowsrc+"' 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()",
10);
}
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()",
10);
}
if (ns4up) {
snowNS();
} else if (ie4up) {
snowIE();
}
/* prelevato su
http://www.grafikat.it */
</script> |