请教这个代码错在那里了-JavaSript-爱易网页

请教这个代码错在那里了

日期：2014-05-16　浏览次数：20373 次

请问这个代码错在那里了?
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN ">

<HTML> <HEAD>
<META http-equiv=Content-Type content= "text/html; charset=gb2312 ">
<SCRIPT language=JavaScript1.2>
var time1 = 0; //打开页面时等待图片载入的时间，单位为秒，可以设置为0
var time2 = 5; //图片轮转的间隔时间

var timeout1 = time1*1000;
var timeout2 = time2*1000;
var nn;
nn=1;//初始焦点
var curFileNum = 1;//传递给myPlayer对象表示目前焦点序列值
if(navigator.appName == "Microsoft Internet Explorer "){
setTimeout( 'change_img() ',timeout1);
}
function change_img(){
if(nn> 5) nn=1
setTimeout( 'setFocus2( '+nn+ ') ',timeout1);
nn++;
tt=setTimeout( 'change_img() ',timeout2);
}
function setFocus2(i){
curFileNum = i;
selectLayer1(i);
}
function setFocus1(i){
nn = i;
curFileNum = i;
selectLayer1(i);
}
function selectLayer1(i){
switch(i){
case 1:
document.getElementById( "focusPic1 ").style.display= "block ";
document.getElementById( "focusPic2 ").style.display= "none ";
document.getElementById( "focusPic3 ").style.display= "none ";
document.getElementById( "focusPic4 ").style.display= "none ";
document.getElementById( "focusPic5 ").style.display= "none ";
break;
case 2:
document.getElementById( "focusPic1 ").style.display= "none ";
document.getElementById( "focusPic2 ").style.display= "block ";
document.getElementById( "focusPic3 ").style.display= "none ";
document.getElementById( "focusPic4 ").style.display= "none ";
document.getElementById( "focusPic5 ").style.display= "none ";
break;
case 3:
document.getElementById( "focusPic1 ").style.display= "none ";
document.getElementById( "focusPic2 ").style.display= "none ";
document.getElementById( "focusPic3 ").style.display= "block ";
document.getElementById( "focusPic4 ").style.display= "none ";
document.getElementById( "focusPic5 ").style.display= "none ";
break;
case 4:
document.getElementById( "focusPic1 ").style.display= "none ";
document.getElementById( "focusPic2 ").style.display= "none ";
document.getElementById( "focusPic3 ").style.display= "none ";
document.getElementById( "focusPic4 ").style.display= "block ";
document.getElementById( "focusPic5 ").style.display= "none ";
break;
case 5:
document.getElementById( "focusPic1 ").style.display= "none ";
document.getElementById( "focusPic2 ").style.display= "none ";
document.getElementById( "focusPic3 ").style.display= "none ";
document.getElementById( "focusPic4 ").style.display= "none ";
document.getElementById( "focusPic5 "

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请教这个代码错在那里了

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