Web Forms :: How To Embed Flash In TinyMCE Rich Text Editor

How can I embed flash in tinymce by entering url

for example [URL].....

in a textbox and pressing a button?

I found embed.js (jscripts/tiny_mce/plugins/media/js/embed.js) and this code is there (last version of tinymce (3.5.8))

function writeEmbed(cls, cb, mt, p) {
var h = '', n;
h += '
'; for (n in p) h += ''; h += '' ;
document.write(h);
}

what must I write inestead of those Question marks to embed flash?

protected void Button1_Click(object sender, EventArgs e) {
string url = TextBox1.Text;
string[] Arry = url.Split('/');
string filename = Arry[Arry.Length - 1];
txttiny.Text += ?????????????????????????????????
Label1.Text = txttiny.Text;
}