Apply Watermark even if PriceFormat plugin is applied to TextBox using jQuery in ASP.Net

hi I use watermark for textboxs below are code:

     <script type="text/javascript">
        window.onload = function SetColorOnPageLoad() {
            var defalutNameText = "از";
            var defalutTellText = "تا";
            functionSetColor(document.getElementById("Txtejare1"), defalutNameText);
            functionSetColor(document.getElementById("Txtejare2"), defalutTellText);
            functionSetColor(document.getElementById("Txtrahn1"), defalutNameText);
            functionSetColor(document.getElementById("Txtrahn2"), defalutTellText);
        }
        function functionSetColor(Textbox, WaterMark) {
            if (Textbox.value.length > 0 && Textbox.value == WaterMark) {
                Textbox.style.color = "#b1b1b1";
            } else {
                Textbox.style.color = "black";
            }
        }
        function WaterMark(txt, evt, msg) {
            if (txt.value.length == 0 && evt.type == "blur") {
                txt.style.color = "#b1b1b1";
                txt.value = msg;
            }
            if (txt.value == msg && evt.type == "focus") {
                txt.style.color = "black";
                txt.value = "";
            }
        }
    </script>

 <asp:TextBox ID="Txtrahn2" runat="server" CssClass="vadi1" ForeColor="#b1b1b1" onblur="WaterMark(this, event,'تا');" onfocus="WaterMark(this, event,'تا');" Text="تا" ></asp:TextBox>
                                <asp:TextBox ID="Txtrahn1" runat="server" CssClass="vadi2" ForeColor="#b1b1b1" onblur="WaterMark(this, event,'از');" onfocus="WaterMark(this, event,'از');" Text="از"></asp:TextBox>

 <asp:TextBox ID="Txtejare2" runat="server" CssClass="eja1" ForeColor="#b1b1b1" onblur="WaterMark(this, event,'تا');" onfocus="WaterMark(this, event,'تا');" Text="تا" onpaste="return false;"></asp:TextBox>
<asp:TextBox ID="Txtejare1" runat="server" CssClass="eja2" ForeColor="#b1b1b1" onblur="WaterMark(this, event,'از');" onfocus="WaterMark(this, event,'از');" Text="از" onpaste="return false;"></asp:TextBox>

now I want use thousand seprator for Txtrahn1 and Txtrahn2 so I add below code:

                  <div>

                                        <script type="text/javascript">
                                         $(function () {
                                             ApplyThousandSeparator();
                                         });

                                         function ApplyThousandSeparator() {
                                             $('#Txtrahn1,#Txtrahn2').priceFormat({
                                                 prefix: '',
                                                 thousandsSeparator: ',',
                                                 centsSeparator: ',',
                                                 limit: 12,
                                                 centsLimit: 0
                                             });
                                         }




                                         //On UpdatePanel Refresh
                                         var prm = Sys.WebForms.PageRequestManager.getInstance();
                                         if (prm != null) {
                                             prm.add_endRequest(function (sender, e) {
                                                 if (sender._postBackSettings.panelsToUpdate != null) {
                                                     ApplyThousandSeparator();
                                                 }
                                             });
                                         };
    </script>

                                </div>

but when I add athousand seprator code it doesn't show water mark in textbox it display 0

see below image:

red arrow is for two other textbox that I don't define seprator for them

it will dispaly water mark

and green arrow is textboxs that I define both code for them thousand seprator and watermark but it will dispaly 0 ...

can you help me ?

best regards

neda