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CodingForums
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This is a 
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 Creating user friendly and self-guiding forms
The disabled attribute, along with JavaScript, can be used
to create highly user friendly and self-guiding forms. For example, you can
temporarily disable the submit button of a form until all the required
elements have been filled in by the user, or a form that disables/ enables
different form elements, depending on the path the user chooses. I'll end
this tutorial with a simple example- it's up to you to go and create the
real thing (ok, I'm just tired and need some rest)!
The below form will only allow you to submit if the textbox
is filled in:
<script type="text/javascript">
function checkifempty(){
if (document.aform.contentarea.value=='')
document.aform.button.disabled=true
else
document.aform.button.disabled=false
}
if (document.all || document.getElementById)
setInterval("checkifempty()",100)
</script>
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