Are you trying to select a textarea within the iframe, or the entire page? The later would be more difficult. If the former though, something like the below should work:
Code:
var myiframe=document.getElementById("aiframe")
if (myiframe.contentDocument) //ns6 syntax
myiframe.contentDocument.myform.mytextarea.select()
else if (myiframe.Document) //ie5+ syntax
myiframe.Document.myform.mytextarea.select()
where "aiframe" is the ID of your iframe, and "myform" and "mytextarea", the name of your form and textarea.
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