Popup Bsp View Loads Twice

Hi All

I have a strange problem.

From the Web IC mvc application I use javascript to display a view with flow logic in a popup modal window.  this view has a textedit and and button.

The javascript loads the window, I hit the button and another instance of the window appears as a full page not a modal window.

Has anyone ever experienced this.  Any help would be great.

Here is the javascript code that is triggered from an onclientclick button event.

function ModalWindow(bpnum) {

    var popup = '/sap/bc/bsp/sap/zic_*****/NoteView.htm?BPNUM=' + bpnum;

    var result = window.showModalDialog(popup,'SalesNote',"dialogHeight:325px,dialogWidth:380px, status:no, help:no, resizable:no;");

    result.moveTo(400,100);

    result.focus();

  }