Hosszúsági mértékegységek átváltása

<div align="center">
<script language="JavaScript"  type="text/javascript"  src="hosszusagvalto.js"> </script>
<form name="atalakito">
<table border="8" class="atvalto_tabla">
<tr><th>Típus</th><th>Érték</th></tr>
<tr><td>
<select name="egyseg">
<option value="MM">Miliméter
<option value="CM">Centiméter
<option value="DM">Deciméter
<option value="M">Méter
<option value="KM">Kilométer
<option value="IN">Inch
<option value="ZN">Zoll
<option value="FT">Foot
<option value="YD">Yard
<option value="OL">ÖL
<option value="VT">Verszt
<option value="MI">Mérföld
</select></td>
<td><input type="text" name="Egysegbe" class="InpErtek" size="20" maxlength="20" value="0"></td></tr>

<tr><td>Miliméter:</td>
<td>
<input type="text" name="mm" class="InpErtek" size="20" maxlength="20" value="0" onFocus="Nfokusz()">
</td></tr>
<tr><td>Centiméter:</td>
<td>
<input type="text" name="cm" class="InpErtek" size="20" maxlength="20" value="0" onFocus="Nfokusz()">
</td></tr>
<tr><td>Deciméter:</td>
<td>
<input type="text" name="dm" class="InpErtek" size="20" maxlength="20" value="0" onFocus="Nfokusz()">
</td></tr>
<tr><td>Méter:</td>
<td>
<input type="text" name="m" class="InpErtek" size="20" maxlength="20" value="0" onFocus="Nfokusz()">
</td></tr>
<tr><td>Kilométer:</td>
<td>
<input type="text" name="km" class="InpErtek" size="20" maxlength="20" value="0" onFocus="Nfokusz()">
</td></tr>
<tr><td>Inch:</td>
<td>
<input type="text" name="inch" class="InpErtek" size="20" maxlength="20" value="0" onFocus="Nfokusz()">
</td></tr>
<tr><td>Zoll:</td>
<td>
<input type="text" name="zoll" class="InpErtek" size="20" maxlength="20" value="0" onFocus="Nfokusz()">
</td></tr>
<tr><td>Foot:</td>
<td>
<input type="text" name="ft" class="InpErtek" size="20" maxlength="20" value="0" onFocus="Nfokusz()">
</td></tr>
<tr><td>Yard:</td>
<td>
<input type="text" name="yd" class="InpErtek" size="20" maxlength="20" value="0" onFocus="Nfokusz()">
</td></tr>
<tr><td>ÖL:</td>
<td>
<input type="text" name="ol" class="InpErtek" size="20" maxlength="20" value="0" onFocus="Nfokusz()">
</td></tr>
<tr><td>Verszt:</td>
<td>
<input type="text" name="vt" class="InpErtek" size="20" maxlength="20" value="0" onFocus="Nfokusz()">
</td></tr>
<tr><td>Mérföld:</td>
<td>
<input type="text" name="mi" class="InpErtek" size="20" maxlength="20" value="0" onFocus="Nfokusz()">
</td></tr>
<tr><td align="center"><br />
<input type="Reset" class="InpErtek" value="Start Újra"><br /><br /></td>
<td align="center"><br />
<input type="button" class="InpErtek" value="Átváltás" onClick="Atvaltas()"><br /><br />
</td></tr>
</table>
</form>
</div>

Nincs, stílusmeghatározás

function Nfokusz()
	{    document.atalakito.Egysegbe.focus()       }
	
var mmValue = 0.1
var cmValue = 1
var dmValue = 10
var mValue = 100
var kmValue = 100000
var inValue = 2.54000843476
var znValue = 2.633
var ftValue = 30.4801012183
var ydValue = 91.440275784
var olValue = 189.6
var vtValue = 106700
var miValue = 160934.708789


function Atvaltas()
{
 var i = document.atalakito.egyseg.selectedIndex
 var azEgyseg = document.atalakito.egyseg.options[i].value

      if (azEgyseg == "CM")
   	{ document.atalakito.cm.value = document.atalakito.Egysegbe.value
   	}
	      else if(azEgyseg == "MM")
   	{  document.atalakito.cm.value = document.atalakito.Egysegbe.value * mmValue
   	}
		      else if(azEgyseg == "DM")
   	{  document.atalakito.cm.value = document.atalakito.Egysegbe.value * dmValue
   	}
      else if(azEgyseg == "M")
   	{  document.atalakito.cm.value = document.atalakito.Egysegbe.value * mValue
   	}
      else if(azEgyseg == "KM" )
   	{ document.atalakito.cm.value = document.atalakito.Egysegbe.value * kmValue
   	}
      else if(azEgyseg == "IN" )
   	{   document.atalakito.cm.value = document.atalakito.Egysegbe.value * inValue
   	}
	      else if(azEgyseg == "ZN" )
   	{   document.atalakito.cm.value = document.atalakito.Egysegbe.value * znValue
   	}
      else if(azEgyseg == "FT" )
   	{  document.atalakito.cm.value = document.atalakito.Egysegbe.value * ftValue
   	}
      else if(azEgyseg == "YD" )
   	{ document.atalakito.cm.value = document.atalakito.Egysegbe.value * ydValue
   	}
	      else if(azEgyseg == "OL" )
   	{ document.atalakito.cm.value = document.atalakito.Egysegbe.value * olValue
   	}
		      else if(azEgyseg == "VT" )
   	{ document.atalakito.cm.value = document.atalakito.Egysegbe.value * vtValue
   	}
      else if(azEgyseg == "MI" )
   	{  document.atalakito.cm.value = document.atalakito.Egysegbe.value * miValue
   	}
   Eredmenyek()
}


function Eredmenyek()
	{	var m = document.atalakito.cm.value
		document.atalakito.mm.value = m / mmValue
		document.atalakito.dm.value = m / dmValue
		document.atalakito.m.value = m / mValue
		document.atalakito.km.value = m / kmValue
		document.atalakito.inch.value = m / inValue
		document.atalakito.zoll.value = m / znValue
		document.atalakito.ft.value = m / ftValue
		document.atalakito.yd.value = m / ydValue
		document.atalakito.ol.value = m / olValue
		document.atalakito.vt.value = m / vtValue
		document.atalakito.mi.value = m / miValue

	}