CFFORM ONCLICK OPEN JAVASCRIPT WINDOW

I am trying to open a new window on an <cfinput type="button">. The window should be a javascript window
and should be able to contain dynamic url variable references, I have tried the following code which opens a window but
I am having trouble putting in a variable into the url as shown below:

<script language="javascript">
var popup;
function popUpWindow(u, w, h){
     popup = doOpen(u, w, h);
     if (popup == null || popup.closed){          
          writeLink();
     }
       else{
            setTimeout("checkPopup()", 200);
     }
}
function doOpen(url, w, h) {
      var f = url;
  return window.open(f, "", "toolbar=no,width=" + w + ",height=" +
    h + ",left=5,top=5,status=no,scrollbars=no,resize=no");
}
function writeLink() {
  var xdoc;
  if (document.getElementById)
    xdoc = document.getElementById("blocked");
  else if (document.all)
    xdoc = document.all("blocked");
  if (xdoc != null) {
    xdoc.innerHTML = "<br>Window blocked.";
  }
}

function checkPopup() {
  if (popup.closed)
    writeLink();
}

</script>

<cfform name="campaign" action="" format="flash" width="100%" height="870" onload="formOnLoad()">
   <cfformitem type="script">
       function openreport(m){
         getUrl("javascript:popUpWindow('index.cfm?mailing=' + m, 800, 600)","")
          }                                   
   </cfformitem>
<cfinput type="button" name="name" value="View" onclick="openreport(45)"/>
</cfform>


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