Urgent question on extra line with Tomcat Jsp

[wtonetwork.com]

Dear all,   I have encounter a strange behaviour with Tomcat 3.2 When I use jsp to output a line to html or other format. The resulting page will append a line before the content. this make some of my applications work inproperly as they parse the content uncorrectly. Does any one encounter similar situation?? How can I determine if it is the problem of Tomcat or other parts??   Thanks Bryan