页面特效--云朵飘飘
<script language="JavaScript1.2">
<!-- Begin

var no = 20; // image number or falling rate
var speed = 2; // the lower the number the faster the image moves
var snow = new Array();
snow[0] = "bubble1.gif"
snow[1] = "bubble1.gif"
snow[2] = "bubble1.gif"

var ns4up = (document.layers) ? 1 : 0; // browser sniffer
var ie4up = (document.all) ? 1 : 0;
var ns6up = (document.getElementById&&!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 = 1800;

if (ns4up||ns6up) {
    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();
j = 0;

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"><img src=""+ snow[j] + "" border="0"></layer>");
        } else {
            document.write("<layer name="dot"+ i +"" left="15" top="15" visibility="show"><img src=""+ snow[j] + "" border="0"></layer>");
        }    } else if (ie4up||ns6up) {        if (i == 0)
{
            document.write("<div id="dot"+ i +"" style="POSITION: absolute; Z-INDEX: "+ i +"VISIBILITY: visible; TOP: 15px; LEFT: 15px; width:1;"><img src="" + snow[j] + "" border="0"></div>");
        } else {
            document.write("<div id="dot"+ i +"" style="POSITION: absolute; Z-INDEX: "+ i +"VISIBILITY: visible; TOP: 15px; LEFT: 15px; width:1;"><img src="" + snow[j] + "" border="0"></div>");
        }
    }
    if (j == (snow.length-1)) { j = 0; } else { j += 1; }
}

function snowNS() { // Netscape main animation function
    for (i = 0; i < no; ++ i) { // iterate for every dot
        yp[i] -= sty[i];        if (yp[i] < -50) {
            xp[i] = Math.random()*(doc_width-am[i]-30);
            yp[i] = doc_height;
            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_NS6() { // IE main animation function
    for (i = 0; i < no; ++ i) { // iterate for every dot
        yp[i] -= sty[i];
        if (yp[i] < -50) {
            xp[i] = Math.random()*(doc_width-am[i]-30);
            yp[i] = doc_height;
            stx[i] = 0.02 + Math.random()/10;
            sty[i] = 0.7 + Math.random();
            doc_width = ns6up?window.innerWidth-5:document.body.clientWidth;
            doc_height = ns6up?window.innerHeight-5:document.body.clientHeight;
        }
        dx[i] += stx[i];
        if (ie4up){
        document.all["dot"+i].style.pixelTop = yp[i];
        document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);
        }
        else if (ns6up){
        document.getElementById("dot"+i).style.top=yp[i];
        document.getElementById("dot"+i).style.left=xp[i] + am[i]*Math.sin(dx[i]);
        }
    }
    setTimeout("snowIE_NS6()", speed);
}

if (ns4up) {
    snowNS();
} else if (ie4up||ns6up) {
    snowIE_NS6();
}
// End -->
</script>
步骤二: , 请把如下图片复制到与文件相同目录下