StarField Simulation V 2.0

Starfield Simulation

Scroll down the page for instructions to install...

Instructions:

Copy and paste the sections of code (found below) where needed.
There are two settings in the script that you can adjust:
1. starnum - Number of stars to display. Less increases performance.
2. starcolors - Array of arbitrary colors to use for the stars.
  When the stars are "created", the script randomly chooses a color from this list.
  You can use Hex color codes (ex: #FFFFFF) or the HTML color name.
  There must be at least one entry in the array. Seperate multiple entries with a comma.
  Example array list: var starcolors=[ '#dddddd' , '#000099' , 'forestgreen' , '#2222aa' , 'darkyellow' ];

Copy and paste the following style declaration in the HEAD section of your page:
Select all...

Copy and paste the following javascript in the BODY section of your page just before the </BODY> tag.:
Select all...

var starnum=75;  //NUMBER OF STARS YOU WANT. SMALLER NUMBER GIVES BETTER PERFORMANCE.

// LIST OF POSSIBLE STAR COLORS. USE AS MANY OR AS FEW (NEEDS AT LEAST ONE) AS YOU WANT.
var starcolors=['#dddddd','#000099','forestgreen','#2222aa','darkyellow'];

var star=new Array();
var so=new Object();
so.ie4=(document.all&&!document.getElementById)?true:false;
so.ns4=(document.layers)?true:false;
so.ie5=(document.all&&document.getElementById;)?true:false;
so.ns6=(document.getElementById&&!document.layers&&!document.all)?true:false;
so.w3c=(document.getElementById)?true:false;
so.tmpx=0; so.tmpy=0;
so.xdir=0; so.ydir=0;
so.deltax=0; so.deltay=0;
so.xoffset=0; so.yoffset=0;
so.w_x=0; so.w_y=0;
so.scrlx=0; so.scrly=0;

function getid(str){
  if(so.ns4)return document.layers[str];
  else if(so.ie4)return document.all[str];
  else if(so.w3c)return document.getElementById(str);
}

function findwindowparams(){
  so.w_x=(so.ie4||so.ie5)?document.body.clientWidth:window.innerWidth;
  so.w_y=(so.ie4||so.ie5)?document.body.clientHeight:window.innerHeight;
  so.xoffset=Math.floor(so.w_x/2);
  so.yoffset=Math.floor(so.w_y/2);
  for(i=1;i<=starnum;i++)getstartpos(i);
}

window.onresize=function(){
  if(so.ns4)setTimeout('history.go(0)',200);
  else findwindowparams();
}

window.onload=function(){
  for(i=1;i<=starnum;i++)star[i]=getid('star'+i);
  findwindowparams();
  var d=(so.ns6)?50:80;
  setInterval('movestar()',d);
}

function writestars(){
  var tc;
  var txt='';
  for(i=1;i<=starnum;i++){
    tc=starcolors[Math.floor(Math.random()*starcolors.length)];
    txt+='<div id="star'+i+'" class="star" style="background-color:'+tc+'; layer-background-color:'+tc+'"></div>';
  }
  return txt;
}

document.write(writestars());
</script>