JSP crystal report problem

Enviornment : BOXi R2 Crystal reports Java

I am trying to fit crystalreportviewer page within our portal but It always opens a new page

I have tried setting

  
CrystalReportViewer viewer = new CrystalReportViewer();
viewer.setReportSource(reportSource);

    viewer.setName("CrystalReportViewer");
    viewer.setOwnPage(false);
    viewer.setDisplayPage(true);
viewer.setOwnForm(true);
    viewer.setParameterFields(parameterFields);
    viewer.setDisplayToolbar(true);
viewer.setWidth(1000);
   viewer.setHeight(1000);

I am unable to get the viewer page within the portal page ( we have a header ,company logo,and a menu on the left etc..)

Does any body know how to set html tags set height widht etc. Any example would help

Thanks in advance