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<!--
// copyright 1999 Idocs, Inc. http://www.idocs.com
// Distribute this script freely but keep this notice in place
function numbersonly(myfield, e, dec)
{
var key;
var keychar;

if (window.event)
  key = window.event.keyCode;
else if (e)
  key = e.which;
else
  return true;
keychar = String.fromCharCode(key);

// control keys
if ((key==null) || (key==0) || (key==8) ||
    (key==9) || (key==13) || (key==27) )
  return true;

// numbers
else if ((("0123456789,").indexOf(keychar) > -1))
  return true;

// decimal point jump
else if (dec && (keychar == "."))
  {
  myfield.form.elements[dec].focus();
  return false;
  }
else
  return false;
}

//-->


onKeyPress=\"return numbersonly(this, event)\"

Virker fortræffeligt!

<input onkeyup="this.value=this.value.replace(/\D/g,'');">