I'm not having much luck with the tutorials I found. I've tried the approaches listed on this page

http://wiki.developer.myspace.com/index.php?title=How_to_Add_Share_on_MySpace_to_Your_Site

 But this seems to cache the meta data of my URL and because I have a dynamic website with changing content, scraping the information out of the meta tags doesnt seem very convenient. So I've tried the non-preferred solution on the bottom of that page in which you can supposedly pass the parameters manually through javascript, but the description still comes out of the meta tag and there doesnt seem to be support for defining the image (also comes from the meta tag).

 I've also tried the post form approach listed in this PDF:
http://x.myspace.com/download/posttomyspacedeveloperdocumentation001.pdf

The promising description claims that I can even pass image tags in the title or content parameters but all of the passed variables are ignored in favor of the meta tag content.

Any suggestions? Are these instructions already obsolete?

 Wow this seems pretty messed up:

I noticed that the content parameter passed through this function completely gets ignored on your server and overwritten with the meta description. So I edited the function to not even pass the c parameter in first place, but that causes the description in the meta tage to not get retrieved. You see in the function below, I'm just passing a zero to the c parameter and now it retrieves the meta description again. 

function GetThis(T,U)
{
    var targetUrl = 'http://www.myspace.com/index.cfm?fuseaction=postto&c=0&t=' + encodeURIComponent(T)
    + '&u=' + encodeURIComponent(U);
    window.open(targetUrl, 'ptm', 'height=450,width=440').focus();
}

 Something doesnt seem sorted out...