der knapper der aktiverer / deaktiverer et script

Jeg har på HTML.dk hentet et komplet lille script.
Jeg har ikke en brik forstand på HTM...

jeg skal bruge et script der viser knap1 og knap2 ved siden af hindanden. Når jeg trykker på knap1 skal den køre det script jeg har hentet, og når jeg klikker på shop2 skal den stoppe scriptet og reloade browseren.

her er det script der skal køres:

<script LANGUAGE="JavaScript1.2">
<!-- Original:  Altan (snow@altan.hr) -->
<!-- Web Site:  http://www.altan.hr/snow -->

<!-- Begin
var no = 20; // snow number
var speed = 7; // smaller number moves the snow faster
var snowflake = "sne.gif";

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>