How to autosize a textarea with the window?

Let's say you have a textarea in a HTML form.
Now you reduce the size of the window.
I need to autosize the textarea as well, otherwise I must scroll down to find the textarea.

How do you reduce the size of the textarea with the window?

I can't seem to find an answer to this.
Thanks in advance for any help!
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A piece of advice is not to try to resize evreything for window, you are asking for trouble and mostly people do not like it
<script language=JavaScript>
  function ResizeTextArea(txtBox)
        nCols = txtBox.cols;
        sVal = txtBox.value;
        nVal = sVal.length;
        nRowCnt = 1;
        for (i=0;i<nVal;i++)
        {   if (sVal.charAt(i).charCodeAt(0) == 13) { nRowCnt +=1; } }  
        if (nRowCnt < (nVal / nCols)) { nRowCnt = 1 + (nVal / nCols); }
        txtBox.rows = nRowCnt;


<form   name=frmSubmit method=post   >
<table border=0 cellspacing=1 cellpadding=1 width='70%' align=center>
<tr><td align=left><textarea  name=txtTest cols=50 rows=1 style='overflow:hidden'> </textarea></td></tr>
<tr><td align=left><a href=# onclick="ResizeTextArea(document.frmSubmit.txtTest);" >Resize</a></td></tr>

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