Simple javascript multiplication help needed.

Simple javascript multiplication code needed.
Bellow is my form.

What is needed:
If I put 2 in first textbox then it will calculate immediately (on fly) the total in second textbox (that means 105.00 in second textbox).

<form method="POST" action="--WEBBOT-SELF--">
  <input type="text" name="T1" size="5"> x $52.50 =
  <input type="text" name="T2" size="10"> <br>
  <br>
  
  <input type="submit" value="Submit" name="B1">
  <input type="reset" value="Reset" name="B2">
</form>

HTML:

PLEASE HELP ME

 

    <form method="POST" action="--WEBBOT-SELF--">
  <input type="text" name="T1" size="5" onkeyup="this.form.T2.value=parseFloat(this.value*52.5)"> x $52.50 =
  <input type="text" name="T2" size="10" id="T2"> <br>
  <br>

  <input type="submit" value="Submit" name="B1" >
  <input type="reset" value="Reset" name="B2">
</form>

Code (markup):

 

Jan Novak,
Thank you very much. It works. THANK YOU