Not sure if you need to implement it in Javascript or CF. Here's both versions:

<!--- CF --->
<cfset form.foo = Replace( form.foo, Chr(10), " ", "all" ) />

<!--- Javascript --->
document.forms.formName.foo.value = document.forms.formName.foo.value.replace(/\n/, " 
");
//note that this is using a regular expression (delimited by the / slashes)

You could put the javascript snippet in a function that gets called in the textarea's 
onchange attribute, or maybe the form's onsubmit attribute...whatever you need to do.

Good luck
Mike Mertsock
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