javascript - Adding additional text to a textbox using jquery -

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i have page when user clicks on button add value textbox. got text add on textbox, inserts value newline. seems include < p > element each time well. there anyway value insert on same line?

i don't know if makes difference using tinymce textbox.

javascript

$(document).ready(function () {         $('#btnaddemailamount').click(function() {                                          var text = $( "#<%= tbxemailmsg.clientid %>" ).val() + " amount";             $( "#<%= tbxemailmsg.clientid %>" ).val( text );           });     });

.aspx 

<div class="dialog" id="pnlemailmsg">         <div class="content" style="width: 685px; margin: 10px auto 10px auto; background-color: #d3d3d3; padding: 15px 30px 30px 30px;">             <h1>edit email message</h1>             <button type="button" id="btnaddemailamount">amount</button><br />             <asp:textbox id="tbxemailmsg" runat="server" height="500px"                 tooltip="500 characters max" rows="4" textmode="multiline" width="645" maxlength="500"></asp:textbox>             <div style="text-align: center; margin-top: 10px">                 <button type="button" id="btncloseemailmsg">close</button>             </div>         </div>         <div class="dialogcoverall"></div>     </div>


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