Changing my "_root." AS for scene compatibility . help?

so alot of my buttons and AS in my site uses the _root. string to navigate the pages .

but now i really need a preloaded , and the only way i know how to make one is using scenes ( one simple preloader scene then the main scene where everything is kept )

but obviously when i do this , all of my MC’s and AS with the _root. doesnt work .

sorry im still a total amateur at actionscript , but what can i change my _root. strings to to be compatible with the scene it’s currently in .

thanks a bunch for the help guys , hope this makes some sense :h:
-chris