IE 6/7访问被拒绝尝试访问弹出窗口。文档

I'm creating a popup window with no URL source using window.open(). I don't give it a URL because soon I'll want to post a form to it. However, in the meantime I'd like to display a short "Now loading..." message so the user isn't looking at a blank page for the 2-3 seconds it'll take the form post to go through.I'm creating a popup window with no URL source