I have six paragraphs of contents on my client's website home page along with number of images and flash banners. All these things make the home page very lengthy. So i have decided to show only 2 paragraphs to the visitors and want to hide remaining 4 paragraphs through "show more" or " read more" button means visitors can see the last 4 paragraphs only after clicking the "show more" or " read more" button. I am using javascrip code to implement this trick. So I want know that will search engines index my last paragraphs or not? Will this affect the website from SEO point of view?
it depends on how you coded the page. most times of "show more" the text is loaded on the page just not visible. if you log into google webmaster central you can fetch your page as googlebot to see what google sees.