function extGVCbkClick(extGVID, cbk, rowIdx, rowstyle_sel, rowstyle_nor) {
    var gv_table = document.getElementById(extGVID);
    var gv_tbody = gv_table.getElementsByTagName("tbody")[0];
    var trowIdx = 1 + rowIdx; //Adding the header index
    var gv_row = gv_tbody.getElementsByTagName("tr")[trowIdx];
    
    if (cbk.checked) {
        gv_row.className = rowstyle_sel;
    }
    else {
        gv_row.className = rowstyle_nor;
    }
}