安装：

步骤一  拷贝以下脚本后贴在有关网页的<head>和</head>之间。

    
<script language="JavaScript1.2"> grphcs=new Array(5) //PRELOAD the involved images (extend or contract variables according to # of images used) Image0=new Image(); Image0.src=grphcs[0]="xq1.gif" Image1=new Image(); Image1.src=grphcs[1]="xq2.gif" Image2=new Image(); Image2.src=grphcs[2]="xq3.gif" Image3=new Image(); Image3.src=grphcs[3]="xq4.gif" Image4=new Image(); Image4.src=grphcs[4]="xq5.gif" Amount=20; Ypos=new Array(); Xpos=new Array(); Zpos=new Array(); //SpeedX=new Array(); //SpeedY=new Array(); ScrXpos=new Array(); ScrYpos=new Array(); Speed=new Array(); Size=new Array(); Step=new Array(); ns=(document.layers)?1:0; ie=document.all&&navigator.userAgent.indexOf("Opera")==-1 if (ns){ for (i = 0; i < Amount; i++){ var P=Math.floor(Math.random()*grphcs.length); rndPic=grphcs[P]; document.write("<LAYER NAME='sn"+i+"' LEFT=0 TOP=0><img src="+rndPic+"></LAYER>"); } //end for } //end if else if (ie){ //IE document.write('<div style="position:absolute;top:0px;left:0px"><div style="position:relative">'); for (i = 0; i < Amount; i++){ document.write('<img id="si'+i+'" src="'+grphcs[Math.round((i+1)*(grphcs.length-1)/Amount)]+'"style="position:absolute;top:0px;left:0px">'); } document.write('</div></div>'); } //initialize star properties if (ie||ns){ WinHeight=(ns)?window.innerHeight-20:window.document.body.clientHeight; WinWidth=(ns)?window.innerWidth-70:window.document.body.clientWidth; for (i=0; i < Amount; i++){ Speed[i]=(i+1)*6/Amount+4; //speed range from 4 to 10 Xpos[i] = (Math.random()*WinWidth-WinWidth/2)*(Amount-i/3)/Amount; Ypos[i] = (Math.random()*WinHeight-WinHeight/2)*(Amount-i/3)/Amount; Zpos[i] = Math.random()*900*(Amount-i/3)/Amount+100; } } function fly(){ var WinHeight=(ns)?window.innerHeight-20:window.document.body.clientHeight; var WinWidth=(ns)?window.innerWidth-70:window.document.body.clientWidth; var hscrll=(ns)?window.pageYOffset:document.body.scrollTop; for (i=0; i < Amount; i++){ Zpos[i]-=Speed[i]; if (ScrXpos[i]>WinWidth || ScrXpos[i]<0 || ScrYpos[i]>WinHeight || ScrYpos[i]<0 || Zpos[i]<=0) { //generate new stars Speed[i]=(i+1)*6/Amount+4; //speed range from 4 to 10 Xpos[i] = (Math.random()*WinWidth-WinWidth/2)*(Amount-i/3)/Amount; Ypos[i] = (Math.random()*WinHeight-WinHeight/2)*(Amount-i/3)/Amount; Zpos[i] = Math.random()*900*(Amount-i/3)/Amount+100; } ScrXpos[i]=Xpos[i]/Zpos[i]*100 + WinWidth/2; ScrYpos[i]=Ypos[i]/Zpos[i]*100 + WinHeight/2; if (ns){ document.layers['sn'+i].left=ScrXpos[i]; document.layers['sn'+i].top=ScrYpos[i]+hscrll; } else{ //IE eval("document.all.si"+i).style.left=ScrXpos[i]; eval("document.all.si"+i).style.top=ScrYpos[i]+hscrll; } } //end for setTimeout('fly()',20); } //end fly if (ie||ns) window.onload=fly //--> </SCRIPT>

步骤二  下载以下五个星球图像，存放在与相关网页同一个文件夹内。