新学html,我还真不会改错，请大家帮我看一下这个程序哪里出错，谢谢！<script type="text/javascript">

希望能说得详细点.........
<script type="text/javascript">
var n=10;
var a=new Array(n)
function Input()
{
var i=0,str=""
i=parseInt(txtI.value)
a[i]=parseFloat(txtA.value);
i=i+1;
txtI.value=i
//显示各元素
n=parseInt(txtArrayLen.value)
for(i=0;i<n;i++)
{
str+=a[i]+","
}
txtArray1.value=str
}
function px()
{ n=parseInt(txtArrayLen.value)
var i,j,t,f;
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
if(a[i]>a[j])
{
t=a[i];
a[i]=a[j];
a[j]=t;
}
}
}
//显示各元素

for(f=0;f<x;f++)
{
str+=a[f]+","
}
txtArray2.value=str
}
</script>

<title> 数组的最大值 </title>
<style type="text/css">
#txtI
{
width: 40px;
color:blue;
}
#txtArrayLen
{
width: 40px;
color:blue;
}
#txtInput
{
width: 60px;
}
#txtArray1
{
width: 600px;
color:red;
}
#txtArray2
{
width: 600px;
color: yellow;
}
</style>
<center><h1>输入10个数，求出最大值</h1></center>
<center style ="font-size :large">
a[<input Id="txtI" type="text" name="txtI" value=0 style ="font-size :large ">]=<input type="text" Id="txtA" name="txtA" value=0 style ="font-size :large"> <input Id="txtInput" type="button" name="txtInput" value="输入" onclick=Input() style ="font-size :large"><br>
==================================================================<br>
数组长度：<input Id="txtArrayLen" type="text" name="txtArrayLen" value=10 style ="font-size :large"><br>
==================================================================<br>
数组元素：<input Id="txtArray1" type="text" name="txtArray1" value=" " style ="font-size :large"><br>
==================================================================<br>
<input type="button" name="txtpx" value="排序" onclick=px() style ="font-size:large"><br>
==================================================================<br>
新序：<input Id="txtArray2" type="text" name="txtArray2" value=" " style ="font-size :large">
</center>

<script type="text/javascript">
var n=10;
var a=new Array(n)
function Input()
{
var i=0,str=""
i=parseInt(txtI.value)
a[i]=parseFloat(txtA.value);
i=i+1;
txtI.value=i
//显示各元素
n=parseInt(txtArrayLen.value)
for(i=0;i<n;i++)
{
str+=a[i]+","
}
txtArray1.value=str
}

function px()
{ n=parseInt(txtArrayLen.value)
var i,j,t,f,str;
str=""
for(i=0;i<n;i++)
{
for(j=i+1;j<n;j++)
{
if(a[i]>a[j])
{
t=a[i];
a[i]=a[j];
a[j]=t;
}
}
}
//显示各元素

for(f=0;f<n;f++)
{
str+=a[f]+","
}
txtArray2.value=str
}
</script>

<title> 数组的最大值 </title>
<style type="text/css">
#txtI
{
width: 40px;
color:blue;
}
#txtArrayLen
{
width: 40px;
color:blue;
}
#txtInput
{
width: 60px;
}
#txtArray1
{
width: 600px;
color:red;
}
#txtArray2
{
width: 600px;
color: yellow;
}
</style>
<center><h1>输入10个数，求出最大值</h1></center>
<center style ="font-size :large">
a[<input Id="txtI" type="text" name="txtI" value=0 style ="font-size :large ">]=<input type="text" Id="txtA" name="txtA" value=0 style ="font-size :large"> <input Id="txtInput" type="button" name="txtInput" value="输入" onclick='Input()' style ="font-size :large"><br>
==================================================================<br>
数组长度：<input Id="txtArrayLen" type="text" name="txtArrayLen" value=10 style ="font-size :large"><br>
==================================================================<br>
数组元素：<input Id="txtArray1" type="text" name="txtArray1" value=" " style ="font-size :large"><br>
==================================================================<br>
<input type="button" name="txtpx" value="排序" onclick=px() style ="font-size:large"><br>
==================================================================<br>
新序：<input Id="txtArray2" type="text" name="txtArray2" value=" " style ="font-size :large">
</center>