To Check Decimal Point Validation, calculate Amount in Grid control based on selected DropDown Value

<script language="javascript">
    
        function CalculateTotalsInGrid(id) {
            var txtControl = document.getElementById(id);
                var NumberEntered = txtControl.value;
                var count = 0;
                var LastIndexOfDot = 0;
                for (var i = 0; i < NumberEntered.length; i++) {
                    if (NumberEntered[i] == '.') {
                        count = count + 1;
                        if (count == 2) {
                            LastIndexOfDot = i;
                        }
                    }
                }
                if (LastIndexOfDot > 0) {
                    document.getElementById(id).value = NumberEntered.substring(0, LastIndexOfDot);
                }
                var totalDoll=0;
                var val1=1;
                if(efg != "INR")
                {                  
                    val1 = parseFloat(document.getElementById('<%=txtExchangerate_TEB.ClientID%>').value);
                }
                var gdv = document.getElementById('<%=gdvExpenseSummary_Travel_TEB.ClientID%>');
                for (var i = 1; i < gdv.rows.length; i++) {
                    var Curramnt =parseFloat(gdv.rows[i].cells[8].childNodes.item(0).value);
                    var date = gdv.rows[i].cells[1].childNodes.item(0).value;
                    var ModeOfTransport = gdv.rows[i].cells[4].childNodes.item(0).value;
                    if (trim(date, " ") != "" && trim(ModeOfTransport, " ") != "")
                    {
                        totalDoll+=Curramnt;
                        gdv.rows[i].cells[9].childNodes.item(0).value =parseFloat(val1 * Curramnt);
                        gdv.rows[i].cells[9].childNodes.item(0).focus();
                    }
                    else
                    {
                        if(date == "")
                        {
                        alert('Please Select Date at Sr.No'+i);
                        }
                        else if(ModeOfTransport == "")
                        {
                        alert('Please Select ModeOfTransport at Sr.No'+i);
                        }
                    }
                }

                var efg=document.getElementById('<%=ddlCurr_Travel_TEB.ClientID%>').value;
                if(efg != "INR")
                {
                var gdv2 = document.getElementById('<%=txtConveyExpenseDyn_Travel_TEB.ClientID%>');
                gdv2.value=parseFloat(totalDoll);
                }
        }