Here I demonstrate an awesome firework effect with javascript,without jquery.
It can be included to any html page, blogger blogs or wordpress page.
you will have to just Copy and paste the code to your page.
In this fireworks code, you can change the speed ,bits,and colors. using many bangs can slow down the script. If you set this firwork speed to smaller,it will be faster script execution.
To add this to your blog, Sign in to blogger, selct your blog, select layout, and click to add html/javascript
then paste this script . Save. you are done.
If you want to add this effect to only one page, then you can do it via blogger conditional tags.
To learn more about blogger conditional tags, please write "blogger conditional tags" in right side search box and search for that.


<script type="text/javascript"> // <![CDATA[ var bits=80; // how many bits var speed=33; // how fast - smaller is faster var bangs=5; // how many can be launched simultaneously (note that using too many can slow the script down) var colours=new Array("#03f", "#f03", "#0e0", "#93f", "#0cf", "#f93", "#f0c");  //                     blue    red     green   purple  cyan    orange  pink /**************************** * Fireworks Effect * http://aslamise.blogspot.com ****************************/ var bangheight=new Array(); var intensity=new Array(); var colour=new Array(); var Xpos=new Array(); var Ypos=new Array(); var dX=new Array(); var dY=new Array(); var stars=new Array(); var decay=new Array(); var swide=800; var shigh=600; var boddie; window.onload=function() { if (document.getElementById) {   var i;   boddie=document.createElement("div");   boddie.style.position="fixed";   boddie.style.top="0px";   boddie.style.left="0px";   boddie.style.overflow="visible";   boddie.style.width="1px";   boddie.style.height="1px";   boddie.style.backgroundColor="transparent";   document.body.appendChild(boddie);   set_width();   for (i=0; i<bangs; i++) {     write_fire(i);     launch(i);     setInterval('stepthrough('+i+')', speed);   } }} function write_fire(N) {   var i, rlef, rdow;   stars[N+'r']=createDiv('|', 12);   boddie.appendChild(stars[N+'r']);   for (i=bits*N; i<bits+bits*N; i++) {     stars[i]=createDiv('*', 13);     boddie.appendChild(stars[i]);   } } function createDiv(char, size) {   var div=document.createElement("div");   div.style.font=size+"px monospace";   div.style.position="absolute";   div.style.backgroundColor="transparent";   div.appendChild(document.createTextNode(char));   return (div); } function launch(N) {   colour[N]=Math.floor(Math.random()*colours.length);   Xpos[N+"r"]=swide*0.5;   Ypos[N+"r"]=shigh-5;   bangheight[N]=Math.round((0.5+Math.random())*shigh*0.4);   dX[N+"r"]=(Math.random()-0.5)*swide/bangheight[N];   if (dX[N+"r"]>1.25) stars[N+"r"].firstChild.nodeValue="/";   else if (dX[N+"r"]<-1.25) stars[N+"r"].firstChild.nodeValue="\\";   else stars[N+"r"].firstChild.nodeValue="|";   stars[N+"r"].style.color=colours[colour[N]]; } function bang(N) {   var i, Z, A=0;   for (i=bits*N; i<bits+bits*N; i++) {      Z=stars[i].style;     Z.left=Xpos[i]+"px";     Z.top=Ypos[i]+"px";     if (decay[i]) decay[i]--;     else A++;     if (decay[i]==15) Z.fontSize="7px";     else if (decay[i]==7) Z.fontSize="2px";     else if (decay[i]==1) Z.visibility="hidden";     Xpos[i]+=dX[i];     Ypos[i]+=(dY[i]+=1.25/intensity[N]);   }   if (A!=bits) setTimeout("bang("+N+")", speed); } function stepthrough(N) {    var i, M, Z;   var oldx=Xpos[N+"r"];   var oldy=Ypos[N+"r"];   Xpos[N+"r"]+=dX[N+"r"];   Ypos[N+"r"]-=4;   if (Ypos[N+"r"]<bangheight[N]) {     M=Math.floor(Math.random()*3*colours.length);     intensity[N]=5+Math.random()*4;     for (i=N*bits; i<bits+bits*N; i++) {       Xpos[i]=Xpos[N+"r"];       Ypos[i]=Ypos[N+"r"];       dY[i]=(Math.random()-0.5)*intensity[N];       dX[i]=(Math.random()-0.5)*(intensity[N]-Math.abs(dY[i]))*1.25;       decay[i]=16+Math.floor(Math.random()*16);       Z=stars[i];       if (M<colours.length) Z.style.color=colours[i%2?colour[N]:M];       else if (M<2*colours.length) Z.style.color=colours[colour[N]];       else Z.style.color=colours[i%colours.length];       Z.style.fontSize="13px";       Z.style.visibility="visible";     }     bang(N);     launch(N);   }   stars[N+"r"].style.left=oldx+"px";   stars[N+"r"].style.top=oldy+"px"; }  window.onresize=set_width; function set_width() {   var sw_min=999999;   var sh_min=999999;   if (document.documentElement && document.documentElement.clientWidth) {     if (document.documentElement.clientWidth>0) sw_min=document.documentElement.clientWidth;     if (document.documentElement.clientHeight>0) sh_min=document.documentElement.clientHeight;   }   if (typeof(self.innerWidth)!="undefined" && self.innerWidth) {     if (self.innerWidth>0 && self.innerWidth<sw_min) sw_min=self.innerWidth;     if (self.innerHeight>0 && self.innerHeight<sh_min) sh_min=self.innerHeight;   }   if (document.body.clientWidth) {     if (document.body.clientWidth>0 && document.body.clientWidth<sw_min) sw_min=document.body.clientWidth;     if (document.body.clientHeight>0 && document.body.clientHeight<sh_min) sh_min=document.body.clientHeight;   }   if (sw_min==999999 || sh_min==999999) {     sw_min=800;     sh_min=600;   }   swide=sw_min;   shigh=sh_min; } // ]]> </script>