While posting mail it opens my aspx file in a seperate window

I have been using this function for a long time and this problem never occured. When the user press send button it does send the form as email but it also opens my aspx file in a seperate window.

Here is the page

http://www.magichair.com.tr/deneme.htm

On the send button I use this code

on (release)
{
loadVariablesNum(“mail.aspx”, “_level”, “POST”);
gotoAndPlay(2);
}

Why is this thing happening?