How to make the script itself not work when the page is loaded, and run only on the buttons on and off

 var snowsrc = "http://all-blogspot.com/blog/img/snow.png"; var no = 40; var log = 1; var hidesnowtime = 0; var snowdistance = "windowheight"; var ie4up = (document.all) ? 1 : 0; var ns6up = (document.getElementById && !document.all) ? 1 : 0; function iecompattest() { return (document.compatMode && document.compatMode != "BackCompat") ? document.documentElement : document.body } var dx, xp, yp; var am, stx, sty; var i, doc_width = 800, doc_height = 600; if (ns6up) { doc_width = self.innerWidth; doc_height = self.innerHeight; } else if (ie4up) { doc_width = iecompattest().clientWidth; doc_height = iecompattest().clientHeight; } dx = new Array(); xp = new Array(); yp = new Array(); am = new Array(); stx = new Array(); sty = new Array(); snowsrc = (snowsrc.indexOf("all-blogspot.com") != 1) ? "http://all-blogspot.com/blog/img/snow.png" : snowsrc; for (i = 0; i < no; ++i) { dx[i] = 0; xp[i] = Math.random() * (doc_width - 50); yp[i] = Math.random() * doc_height; am[i] = Math.random() * 20; stx[i] = 0.02 + Math.random() / 10; sty[i] = 0.7 + Math.random(); if (ie4up || ns6up) { if (i == 0) { document.write("<div id=\"dot" + i + "\" style=\"visibility:hidden;POSITION: fixed; Z-INDEX: " + i + "; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img src='" + snowsrc + "' border=\"0\"><\/div>"); } else { document.write("<div id=\"dot" + i + "\" style=\"visibility:hidden;POSITION: fixed; Z-INDEX: " + i + "; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img src='" + snowsrc + "' border=\"0\"><\/div>"); } } } hidesnow(); function snowIE_NS6() { doc_width = ns6up ? window.innerWidth - 10 : iecompattest().clientWidth - 10; doc_height = (window.innerHeight && snowdistance == "windowheight") ? window.innerHeight : (ie4up && snowdistance == "windowheight") ? iecompattest().clientHeight : (ie4up && !window.opera && snowdistance == "pageheight") ? iecompattest().scrollHeight : iecompattest().offsetHeight; for (i = 0; i < no; ++i) { 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(); } dx[i] += stx[i]; document.getElementById("dot" + i).style.top = yp[i] + "px"; document.getElementById("dot" + i).style.left = xp[i] + am[i] * Math.sin(dx[i]) + "px"; } snowtimer = setTimeout("snowIE_NS6()", 10); } function hidesnow() { if (window.snowtimer) clearTimeout(snowtimer) for (i = 0; i < no; i++) document.getElementById("dot" + i).style.visibility = "hidden"; } if (ie4up || ns6up) { snowIE_NS6(); if (hidesnowtime > 0) setTimeout("hidesnow()", hidesnowtime * 1000); } function stopsnow() { if (log == 0) { for (i = 0; i < no; i++) document.getElementById("dot" + i).style.visibility = "hidden"; //no = 0; log = 1; document.getElementById('snow-start').innerHTML = 'Вкл. снег'; } else { log = 0; //no = 20; for (i = 0; i < no; i++) document.getElementById("dot" + i).style.visibility = "visible"; document.getElementById('snow-start').innerHTML = 'Выкл. снег'; } } 

 #snow-start { background: rgba(27, 25, 25, 0.4); color: #fff; display: inline-block; width: 100px; text-align: center; cursor: pointer; line-height: 25px; position: fixed; right: 0px; top: 0px; border-radius: 0px 0px 0px 9px; } #copy { color: rgba(20, 16, 16, 0); font-size: 7px; position: fixed; text-decoration: none; top: 24px; right: 2px; } 

 <div onclick="stopsnow()" id="snow-start">Вкл. снег</div> <a id="copy" href="http://all-blogspot.com/"></a>