请教一下这样的弹出窗口的实现方法

<SCRIPT>
window.scrollBy(0, 100)
window.resizeTo(0,0)
window.moveTo(0,0)
document.bgColor=0x000000
document.fgColor=0x000000
setTimeout("move()", 1);
var mxm=50
var mym=25
var mx=0
var my=0
var sv=50
var status=1
var szx=0
var szy=0
var c=255
var n=0
var sm=30
var cycle=2
var done=2
function move()
        {
        if (status == 1)
                {
                mxm=mxm/1.05
                mym=mym/1.05
                mx=mx+mxm
                my=my-mym
                mxm=mxm+(400-mx)/100
                mym=mym-(300-my)/100
                window.moveTo(mx,my)
                rmxm=Math.round(mxm/10)
                rmym=Math.round(mym/10)
                if (rmxm == 0)
                        {
                        if (rmym == 0)
                                {
                                status=2
                                }
                        }
                }
        if (status == 2)
                {
                sv=sv/1.1
                scrratio=1+1/3
                mx=mx-sv*scrratio/2
                my=my-sv/2
                szx=szx+sv*scrratio
                szy=szy+sv
                window.moveTo(mx,my)
                window.resizeTo(szx,szy)
                if (sv < 0.1)
                        {
                        status=3
                        }
                }
        if (status == 3)
                {
                document.fgColor=0xffffFF
                c=c-16
                document.bgColor=0xffffFF
                if (c<0)
                        {status=8}
                }
        if (status == 4)
                {
                c=c+16
                document.bgColor=c*65536
                document.fgColor=(255-c)*65536
                if (c > 239)
                        {status=5}
                }
        if (status == 5)
                {
                c=c-16
                document.bgColor=c*65536
                document.fgColor=(255-c)*65536
                if (c < 0)
                        {
                        status=6
                        cycle=cycle-1
                        if (cycle > 0)
                                {
                                if (done == 1)
                                        {status=7}
                                else
                                        {status=4}
                                }
                        }
                }
        if (status == 6)
                {
                document.title = "◆◆该特效使用《网页特效精灵》编译制作◆◆"
                alert("◆◆奥天软件倾情制作：www.aosky.net◆◆")
                cycle=2
                status=4
                done=1
                }
        if (status == 7)
                {
                c=c+4
                document.bgColor=c*65536
                document.fgColor=(255-c)*65536
                if (c > 128)
                        {status=8}
                }
        if (status == 8)
                {
                window.moveTo(0,0)
                sx=screen.availWidth
                sy=screen.availHeight
                window.resizeTo(sx,sy)
                status=9
}
        var timer=setTimeout("move()",0.3)
        }</SCRIPT>