POST data using getURL?

Hi All !
             I am trying to use the getURL() function to POST data to a
coldfusion webpage.
Can anyone guide me on how to do this.  Thanks !

For e,g, in this code I want to send the value of a to the page
posttest.cfm.

=====================================
<cfform format="flash">

<cfformitem type="script">
 function postdata()
 {
    var a:Number;
    a=11;
    getURL ("http://127.0.0.1/flash/posttest.cfm",
"_blank", "POST");
 }
</cfformitem>

<cfinput type="button" name="btn" value="Post Data"
onclick="postdata();">

</cfform>
=========================================

Harkirat