flash ad development: I want to add a flash (swf) banner ad to an existing site but don't know how.

Can someone give me instructions/code to do this.

add this code to your html page:
<OBJECT style="WIDTH: 270px; HEIGHT: 439px; z-index: 110; left: 610px;
position: relative; top: 195px;" align="textTop"
classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#ve
rsion=5,0,0,0" id="side"
[quoted text, click to view]
<param name="_cx" value="4419">
<param name="_cy" value="20188">
<param name="FlashVars" value="">
<param name="Movie" value="nameOfFile.swf">
<param name="Src" value="nameOfFile.swf">
<param name="WMode" value="Transparent">
<param name="Play" value="0">
<param name="Loop" value="-1">
<param name="Quality" value="High">
<param name="SAlign" value="">
<param name="Menu" value="-1">
<param name="Base" value="">
<param name="AllowScriptAccess" value="always">
<param name="Scale" value="ExactFit">
<param name="DeviceFont" value="0">
<param name="EmbedMovie" value="0">
<param name="BGColor" value="">
<param name="SWRemote" value="">
<param name="MovieData" value="">
<param name="SeamlessTabbing" value="1">
<EMBED src="nameOfFile.swf" width="500" height="700"
PLUGINSPAGE="http://www.macromedia.com/shockwave/download/index.cgi?
P1_Prod_Version=ShockwaveFlash">
</EMBED>
</OBJECT>[h]Text[/h]

I have a banner software that runs an Javascript to display the banner in the ad. How can I import this into a flash movie. I like to have those banners within flash movie?