字符渐变出现

下面框中为脚本显示区

脚本说明：
第一步：把如下代码加入<body>区域中:
 <div class="ttl1" id="ttl0"> 
        <script language="javascript1.2">
var layers = document.layers;
var style = document.all;
var both = layers || style;
var huliguo_b = 0;
var huliguo_c = 4;
function writeOnText(obj, str) {
    if (layers) with (document[obj]){
        document.open();
        document.write(str);
        document.close();
    }
    if (style) eval(obj+'.innerHTML= str');
}
var dispStr = new Array("欢迎光临网络编程精彩网页特效栏目      ",
"本站点的地址是：http://www.7stk.com",
"请多提意见，谢谢。webmaster@j0.com",
"");
function txtTyper(str, idx, idObj, spObj, clr1, clr2, delay){
    var tmp0 = tmp1 = ''
    var skip =100;
    if (both && idx <= str.length){
        if (str.charAt(idx) == '<'){while (str.charAt(idx) != '>') idx++; idx++;}
        if (str.charAt(idx) == '&' && str.charAt(idx+1) != ' ') {while (str.charAt(idx) != ';') idx++; idx++;}
        tmp0 = str.slice(0,idx);
        tmp1 = str.charAt(idx++);
         writeOnText(idObj, "<span class="+spObj+"><font color='"+clr1+"'><b>"+tmp0+"</b></font><font color='"+clr2+"'>"+tmp1+"</font></span>");
        setTimeout("txtTyper('"+str+"', "+idx+", '"+idObj+"', '"+spObj+"', '"+clr1+"', '"+clr2+"', "+delay+")",delay);
    }
    else{
        huliguo_b++;
        init();
    }
}

function init(){
        if (huliguo_b == huliguo_c) huliguo_b = 0;
        txtTyper(dispStr[huliguo_b], 0, 'ttl0', 'ttl1', '#6666ff', '#9999ff', 100);
}
</script>
      </div>

第二步：把<body>中的内容改为：
<body bgcolor="#fef4d9" onLoad=init()>