<%@ page language="java" %>
<script language="javascript" >
<!--
     function cleardata(){
       for( i=0; i<document.frm.txtCourseName.length; i++ )
	 document.frm.txtCourseName[i].value="";
       }	
//-->
</script>
<%
     String  errorMessage = "",
             teacherName = request.getParameter("txtTeacherName").trim(),
	     className = request.getParameter("txtClassName").trim();
     int studentNum=0,
	    courseNum=0;
     if( teacherName.length()==0 ) errorMessage += "