JavaScript function inside JSP not working

["yuensunlam@yahoo.com" <yu...@yahoo.com>]

I include the following javascript function in my .jsp
file, but this function is not being called at all.  I
won't even get any javascript error on build if I
tried to change to some bogus function name, Can
anybody please tell me why?

What I want to do here is: disable the submit button
until the required text field was filled. 

<SCRIPT LANGUAGE="JavaScript">
function checkField() {
return(!document.form1.textfield.value == "")
}
</SCRIPT> 
 
 <html:form
      action="myAction"
      name="form1"
      onsubmit="checkField()">
 <html:text property="textfield">
 <html:submit property="submit" value="Submit">
 </html:form>



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