extjs

var  record_start=0;
columns:[new ext.grid.RowNumber([
    width:89,
     rendered:function(value,metedata,record,rowindex){
     return  record_start +1 + rowindex;
}
])]


doload:function(start){
        record_start = start;
        var o={};pn=this.paramsNames;
         o.[pn.start]=start;
         o.[pn.limit]=this.pageSize;
          this.store.load({params:o});

}