Select GridView Row

    <script>
            var SelectRowIndex=0;
            var SelectRowColor;

            function OnRowClick(rowIndex,id)
            {
                if(SelectRowIndex>0) document.getElementById("GVlist").rows(SelectRowIndex).style.backgroundColor=SelectRowColor;
                SelectRowIndex=rowIndex;
                var selectRow=document.getElementById("GVlist").rows(rowIndex);
                SelectRowColor=selectRow.style.backgroundColor;
                selectRow.style.backgroundColor="#6699ff";
                
                var SelectId=document.getElementById("txtSelectId");
                SelectId.value = id      
            }

    </script>