Opening multiple URLs in sequence

[ken_s2007]

I'm trying to make a solution IWP-compatible (testing in FMP Advanced 10.0v3). I'm currently testing on my own machine, but will eventually move to a server.

THE PROBLEM: I want to have multiple "Open URL" commands run in sequence. When I do so, the first one opens in a new tab as I want it, but the subsequent tabs or windows all load the same URL (one of the ones specified); not the other ones.

The script has two if/end if structures, that determine what kind of client is active (FMP or IWP), then runs the same basic logic (see following), only for IWP, it uses "Open File" (which works perfectly), and for IWP, uses "Open URL"

Within the if/end if structure that script goes into, scripting determines which of four checkboxes have been selected in a field, and then based on that, again, opens those files (in FMP) or URLs (in IWP).

A CHUNK OF THE FMP CODE:

PatternCount(login::db_selector; "db1") and PatternCount(login::db_selector; "db2") and PatternCount(login::db_selector; "db3") and PatternCount(login::db_selector; "db4")

Open File ["db1"]

Open File ["db2"]

Open File ["db3"]

Open File ["db4"]

A CHUNK OF THE IWP CODE:

PatternCount(login::db_selector; "db1") and PatternCount(login::db_selector; "db2") and PatternCount(login::db_selector; "db3") and PatternCount(login::db_selector; "db4")

Open URL [No dialog; "http://127.0.0.1:591/fmi/iwp/cgi?-db=db1&-loadframes"]

Open URL [No dialog; "http://127.0.0.1:591/fmi/iwp/cgi?-db=db2&-loadframes"]

Open URL [No dialog; "http://127.0.0.1:591/fmi/iwp/cgi?-db=db3&-loadframes"]

Open URL [No dialog; "http://127.0.0.1:591/fmi/iwp/cgi?-db=db4&-loadframes"]

OS X 10.6.8

Firefox 8.0.1

"A script step attempted to open a url, but failed because popup windows are being blocked by your browser. Please disable popup blocking and try again."

Once the site was added to pop up blocking exceptions, the first url opened in two new tabs (when there were two Open URLs steps).

Safari 5.1.5

Same behavior as Firefox.

Chrome 18.0.xxx

Same behavior as Firefox and Safari, except the urls are opened in new windows, not tabs.

Is there a way in FileMaker to have the urls open in tabs, vs. new windows, or is that purely browser controlled?

Anyone know the solution? I'm new to IWP, so it is likely something pretty basic. Thank you.

Ken