Hey guys. I have just started javascript, because I am currently writing my web page. Why wont this work?

<HTML>
<HEAD>
<TITLE> Lab </TITLE>

</HEAD>

<BODY bgcolor='white'>

<SCRIPT language="JavaScript">
<!--hide from old browsers
<form name="myform">
<input name="button">
<FORM name="myform"> <INPUT type="text" name="myTextInput" size=30 maxlength=30 value="this is a 1 line text box">
<P>
</FORM>
//-->
</SCRIPT>

</BODY>
</HTML>

I tried many times, and it wont work. It gives me a syntax error. Please help me.Thank you