It's possible.

 

Try the following solution, you can modify it to meet your own requirements.

 

Open InsertImage.Frame.aspx and find the following code:

 

            <tr>
               <td width="100" nowrap>[[Width]]:</td>
               <td>
                <INPUT TYPE="text" SIZE="2" id="inp_width" onkeyup="checkConstrains('width');" ONKEYPRESS="event.returnValue=IsDigit();" style="WIDTH : 80px">
               </td>
               <td rowspan="2" align="right" valign="middle"><img src="../images/locked.gif" id="imgLock" width="25" height="32" alt="Constrained Proportions" /></td>
              </tr>
              <tr>
               <td nowrap>[[Height]]:</td>
               <td>
                <INPUT TYPE="text" SIZE="2" id="inp_height" onkeyup="checkConstrains('height');" ONKEYPRESS="event.returnValue=IsDigit();" style="WIDTH : 80px">
               </td>
              </tr>

 

 

Change it to:

 

 

Hope it helps.