Get Url from all tabs

How would I write a script that just gets the urls of all tabs in safari?

tell application "WebKit"
get URL of every tab of every window
end tell

then if one exists, it selects that tab to be opened.

tell application "WebKit"
repeat with theWindow in every window
set theTabs to theWindow's tabs --of every window
repeat with eachTab in theTabs
if URL of eachTab = "http://www.google.com/" then
set current tab of theWindow to eachTab
if index of theWindow is not 1 then
set index of theWindow to 1
end if
end if
end repeat
end repeat
end tell

Would It be easier that instead of telling safari to open that tab if it exists, to set the beginning part of my script that gets info from safari to get info from all tabs, for a specific tab only?

I purchased a book http://apress.com/book/view/1430223618 which I am going to use to better help me make applescripts as well as cocoa-applescript applications in xcode. Do you think this book will be able to help, or is there another I should look at?

tell application "WebKit"
 set oldTabs to get URL of every tab of every window
 delay 1
 repeat with currentWindow in every window
 set allTabs to currentWindow's tabs
 repeat with currentTab in allTabs
 if oldTabs does not contain URL of currentTab then
 --here is where you want the info of currentTab
 --eg display dialog currentTab --though display dialog may stop/ruin your script
 end if
 end repeat
 end repeat
end tell

filmmakerc14 wrote:
I think it is what I am looking for. What exactly is this part about though:

repeat with currentWindow in every window
set allTabs to currentWindow's tabs
repeat with currentTab in allTabs

on idle ()
 if not oldURL then set oldURL to getURL()
 if oldURL then set newURL to getURL()
 if not newURL then set oldURL to null
 if oldURL is not equal to newURL then
 display dialog newURL
 set oldURL to newURL
 end if
 return 1
end idle
on getURL()
 tell application "WebKit"
 repeat with currentWindow in every window
 set allTabs to currentWindow's tabs
 repeat with currentTab in allTabs
 if URL of currentTab contains "keyword" then
 return (URL of currentTab)
 end if
 end repeat
 end repeat
 end tell
 return null
end getURL