Input Text Question

I have an input text field beneath a video and I want to put some html code in the input text field so that a viewer can select that text and put the embed code on their site (similar to youtube). The problem is that I want the input text field to be a certain width and the length of the code snippet exceeds that length. Is there a way to do it so that the part of the code that goes past the length of what I want my input text field to be is cropped, but is still selectable by the user? I’ve seen this done with html form fields, but not flash.

Thanks for your help