调节文字显示速度

下面为效果显示区!

脚本说明:
第一步:把如下代码加入<body>区域中
<script language="javascript">
tid = 0;
pause = 0;
var to;
var bcount;
var tcount;

function bannerArray() {
   this.length = 54;
   this[1] = "                           W";
   this[2] = "                          We";
   this[3] = "                         Wel";
   this[4] = "                        Welc";
   this[5] = "                       Welco";
   this[6] = "                      Welcom";
   this[7] = "                     Welcome";
   this[8] = "                    Welcome ";
   this[9] = "                   Welcome t";
   this[10] = "                 Welcome to";
   this[11] = "                Welcome to ";
   this[12] = "               Welcome to I";
   this[13] = "              Welcome to IM";
   this[14] = "             Welcome to IMA";
   this[15] = "            Welcome to IMA S";
   this[16] = "           Welcome to IMA ST";
   this[17] = "          Welcome to IMA STU";
   this[18] = "         Welcome to IMA STUD";
   this[19] = "        Welcome to IMA STUDI ";
   this[20] = "       Welcome to IMA STUDIO";
   this[21] = "      Welcome to IMA STUDIOS";
   this[22] = "     Welcome to IMA STUDIOS'";
   this[23] = "    Welcome to IMA STUDIOS' Si";
   this[24] = "   Welcome to IMA STUDIOS' Sit";
   this[25] = "  Welcome to  IMA STUDIOS' Site!";
   this[26] = " ";
   this[27] = "  Welcome to  IMA STUDIOS' Site! ";
   this[28] = " ";
   this[29] = "  Welcome to IMA STUDIOS' Site! ";
   this[30] = " Welcome to IMA STUDIOS' Site! ";
   this[31] = "Welcome to IMA STUDIOS'  Site! ";
   this[32] = "elcome to IMA STUDIOS'  Site!   ";
   this[33] = "lcome to IMA STUDIOS' Site!   ";
   this[34] = "come to IMA STUDIOS' Site!  ";
   this[35] = "ome to IMA STUDIOS'  Site! ";
   this[36] = "me to IMA STUDIOS'  Site!";
   this[37] = "e to IMA STUDIOS'  Site! ";
   this[38] = "to IMA STUDIOS'  Site!";
   this[39] = "o IMA STUDIOS'  Site! ";
   this[40] = " IMA STUDIOS'  Site!";
   this[41] = " MA STUDIOS'  Site!";
   this[42] = "A STUDIOS'  Site ";
   this[43] = "STUDIOS'  Site!";
   this[44] = "TUDIOS'  Site!";
   this[45] = "UDIOS'  Site!";
   this[46] = "DIOS'  Site!";
   this[47] = "'IOS'  Site!";
   this[48] = "OS'  Site!";
   this[49] = " S'  Site!";
   this[50] = "'  Site!";
   this[51] = "  Site!";
   this[52] = "ite!";
   this[53] = "te!";
   this[54] = " e!";
   return this
}

function MakeArray(n) {
        this.length = n;
        return this
}

banner = new bannerArray();
IMAbanner = 1;

function banner1(n) {
                tid=window.setTimeout("banner1(IMAbanner)",to);
                f.result.value = banner[IMAbanner];
                window.status = banner[IMAbanner];
                IMAbanner = IMAbanner + 1;
                if (IMAbanner == 55) {
                        IMAbanner = 1;
                                window.clearTimeout(tid);
                                tid=window.setTimeout("banner1()",to);
                }
}

function start(x) {
                f=x;
                to=60;
                banner1(x);
}

function speedup() {
        if (to != 0) {
                to = to-30;
        }
}

function slowdown() {
        to = to+30;
}

function refr() {
        to = 90;
        IMAbanner = 1;
}

function cleartids() {
        window.clearTimeout(tid);
}

</script>

第二步:把如下代码加入<body>区域中
<body bgcolor="#fef4d9" onload="start(document.forms[0])" onunload="cleartids()">