sanjs - Here is a page I use that does what you want.
The variable(LessonNameVar) comes in through the URL , then is sent to the flash movie in the two lines that begin with
" <param name= " AND
" <embed src= "
************** CODE ****************
<%@LANGUAGE="VBSCRIPT" %>
<%
Dim LessonNameVar
LessonNameVar = Request("LessonNameField"

'Response.write LessonNameVar ' Used for checking out Variable
%>
<html>
<head>
<title>Main</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body bgcolor="#FFFFFF" text="#000000" leftmargin="0" topmargin="0">
<div align="left"><font size="+4"></font>
<object classid="clsid

27CDB6E-AE6D-11cf-96B8-444553540000" codebase="
shockwave/cabs/flash/swflash.cab#version=5,0,0,0" width="774" height="424">
<param name=movie value="Login.swf?LessonNameVar=<%=(LessonNameVar)%>">
<param name=quality value=high>
<embed src="Login.swf?LessonNameVar=<%=(LessonNameVar)%>" quality=high pluginspage="
download/index.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="774" height="424">
</embed>
</object></div>
</body>
</html>
*****************************************
To view the variable in Flash you have to create a text box that is DYNAMIC, and name it "LessonNameVar"
Let me know how you do.