Enable on submit button after text entered

Ive got a single search field and button.  I want to load the submit button disable by default, and then enable it only if text is entered into the search field.  I also need to disable it again if the text is deleted.  Can this be done with javascript?
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yep, just add a function to the text area onKeyUp="checkIt(this.form)"

then define checkIt(myForm) as:
if (myform.textfield.value="") then myform.submitbutton.enabled=false

that is it... syntax may need a bit a tweaking, but pretty much that will work.

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