GetURL not opening in right frame

Hi Guys, I have read previous posts regarding the subject but they all seem to come to a dead end. Due to “security” reasons flash player does not open Urls **LOCALLY **using the GetUrl instruction in no other frame than “_blank”. I am trying to show a customer a site which hasn’t yet been uploaded online and I get a bunch of new browser windows every time I click on a button. Have tried the AllowScriptAccess=“always” (doesn’t work), have tried renaming the mainFrame to another name (doesn´t work) and running out of ideas here.
Has anyone encountered a similar situation? How did you solve it? Thanks in advance…