The requested method POST is not allowed for the URL

I have a page with 3 frames,the top is static(a jpg and a banner), the left one has the menu build in flash, and the main frame is where the "action goes".
I want to click in the bottoms that are in the flash and a new page appears in the main frame, in my computer this works fine, but when i uploaded in to the server it gives the error "The requested method POST is not allowed "
The target´s of the bottom are, one of them;
on (release) {
getURL("menu grupos 3.html", "_self", "POST");
}
on (release) {
getURL("construcao.htm", "mainFrame", "POST");
}

I Don´t hane no forms in the page.
I hope now you can tell me something