Testing the contents of dynamic text fields

I have used php to generate a response to a request to send information via a contact form in flash mx.

If the mail is sent a response from the server in the form of:

Server response:Mail Sent

is loaded into the text field

What I want to do is load one page if this text is present in the text field and load another if some other text is present.

Could I use for example:

if(Errors_Status.text==Server response:Mail Sent){
do this…
}
else
{do this
}

I have created a function that runs if the loading of the php variable is successful.

onLoad function (success)
if(success){
do this…

but this only tests if the variable was received and the result could also be Server response:Mail not sent

I think maybe the first solution could work.

Any ideas out there??