자바 스크립트 공부하는데 ㅠ.ㅠ..

ㅁinches = ㅁ centimeter
ㅁpounds = ㅁ kilograms
ㅁquarts = ㅁ liters

이런식으로  유닛 컨버전하는 창을 띄워서 돌아가야하는데 ㅠ.ㅠ.

어떻게 해야할지 감도안잡히네요 도와주세요.......
인치에서 -> 센치로 만되면되요 센치 -> 인치는 xx

<HTML>

<HEAD>

<TITLE>Unit Converter</TITLE>

<스크립트>

</스크립트>

</HEAD>

<BODY>

If you enter a number into one of the boxes in the first
column and then press the corresponding "=" button, a metric
equivalent will appear in the fourth column.

<P>

<FORM NAME="units">

<TABLE>

<TR>

  <TD>




  </TD>

  <TD>
    inches
  </TD>

  <TD>
    <INPUT
      TYPE=button
      VALUE="="
      온클릭="inchesToCentimeters();">
  </TD>

  <TD>




  </TD>

  <TD>
    centimeters
  </TD>

</TR>

<TR>

  <TD>




  </TD>

  <TD>
    pounds
  </TD>

  <TD>
    <INPUT
      TYPE=button
      VALUE="="
      온클릭="poundsToKilograms();">
  </TD>

  <TD>




  </TD>

  <TD>
    kilograms
  </TD>

</TR>

<TR>

  <TD>




  </TD>

  <TD>
    quarts
  </TD>

  <TD>
    <INPUT
      TYPE=button
      VALUE="="
      온클릭="quartsToLiters();">
  </TD>

  <TD>




  </TD>

  <TD>
    liters
  </TD>

</TR>

</TABLE>

</FORM>

</BODY>

</HTML>