CFGRID Item No.

i have this cfgrid program and i want to put the item no. in the table but its not working... please help...

    <cfgrid format="html"
                name="maingrid"
                  bind="url:cfc/user.cfm?page={cfgridpage}&pageSize={cfgridpagesize}&sortCol={cfgridsortcolumn}&sortDir={cfgridsortdirection}&staff_emp=#staff_emp#&start_date=#start_date#&end_date=#end_date#&txtuserid=#txtuserid#&company1=#company1#"
                preservepageonsort="true"
                appendkey="no"           
                selectonload="false"
                width="750"                           
                style="clear:both;" colheaderalign="center" striperows="yes"
                >   
               <cfset l_pos=1>
                <cfset l_posit=1>                                        
                                                                           
                <cfgridcolumn name="chuva" header="<center>NO.</center>" width="30"/>               
                <cfset chuva=l_posit+1>          
                <cfgridcolumn name="datatime" header="<center>DATE</center>" width="100"/>
                <cfgridcolumn name="status" header="<center>STATUS</center>" textcolor="##FF0000" width="100"/>
                <cfgridcolumn name="timeindatetime" header="<center>TIME IN</center>" width="100" />
                <cfgridcolumn name="timeoutdatetime" header="<center>TIME OUT</center>" width="100"/>
                <cfgridcolumn name="dayconworkhrs" header="<center>CONTRACT HRS</center>" width="100"/>
                <cfgridcolumn name="daytotalreghrs" header="<center>TOTAL HRS</center>" width="75"/>       
                <cfgridcolumn name="daytotalothrs" header="<center>OVERTIME</center>" width="75" />
                <cfgridcolumn name="DayTotalUndertime" header="<center>UNDERTIME</center>" width="75" select="yes"/>               
            </cfgrid>
        </cfform>

output is:

based on my program all the columns is working but the NO. column is not appearing i want to put some item no. there in every rows... like 1...2...3.... and so on.. please help... thanks!