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Character Counter for Multiline Textbox

 here's the script in the :
 
 
And here is the  where the script is invoked: 
 ID="uxCommentsNoTextbox" runat="server" Height="100" Width="550" 
 Wrap="true"TextMode="MultiLine" 
 onkeyup="textCounter(uxCommentsNoTextbox, this.form.uxCommentsCharCount, 1500);" 
 onkeydown="textCounter(uxCommentsNoTextbox, this.form.uxCommentsNoCharCount, 1500);" 
 
And the above is referring to an input field with id of "uxCommentsCharCount", which is here: />
 
 readonly="readonly" type="text" id="uxCommentsNoCharCount" 
 name="uxCommentsNoCharCount"
       size="4" maxlength="4" value="" 
 style="border: solid 0px white; background: white;" /> 

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