oh in my second example, ya i know, i should write like this
<%!
Vector wp = new Vector();
Vector ln = new Vector();
%>

then how about this sentence of code, izzit correct?
<td><input type="text" size=8 name="brkID<%=c%>" id="brkID" value='<%=brkID.elementAt(c)%>' onFocus="chkBreakdown('<%=wp.elementAt(c)%>','<%=l n.elementAt(c)%>','<%=la_no%>');"></td>

when on focus, then call a function together with 3 parameters.