Page same size of iframe

Hello,

i want to know if it’s possible to make something for have exactly the same size for my page and the iframe inside ?

Sometime my iframe have a height of “2000” and sometimes size height will be “6000” and if i don’t put ON for the scroller i don’t see all the iframe, and if i put YES for the scrolling i have the page scroll + iframe scroll !

i can give the link of website in private if needed.
Sorry for my english

Thanks helping ??