Hi,
Why would you want to change your texbox to a Textarea?
I don't understand the question.
To use onblur event on Textbox DTC's you have to:
<SCRIPT ID=serverEventHandlersVBS LANGUAGE=vbscript RUNAT=Server>
Sub thisPage_onenter()
Textbox1.advise "onblur", "MyFunc"
End Sub
</SCRIPT>
<script language=javascript>
function thisPage_onbeforeserverevent(obj,evnt){
if (obj=="Textbox1"

{
if (evnt=="onblur"

{
if (document.thisForm.Textbox1.value != "whatever"

{
thisPage.cancelEvent=true;
document.thisForm.Textbox1.focus();
alert("NOT!"

;
else
//do whatever you want here, if you do nothing it will go to the server side function MyFunc, so you'll need to create it, but this is not necessary, if you skip the else part
}
}
}
}
</script>
Hope this helps

"Defeat is not the worst of failures. Not to have tried is the true failure."
-George E. Woodberry