<!--
// copyright 1999 Idocs, Inc. http://www.idocs.com
// Distribute this script freely but keep this notice in place
// Edited by Kris Borgerink (http://kris.isme.nl) giving you more options what to include and/or exclude
//
// EXAMPLES:
//
// <input type="text" onkeypress="return allowchar(this, event, numbers)" />
// <input type="text" onkeypress="return allowchar(this, event, letters)" />
// <input type="text" onkeypress="return allowchar(this, event, numbers+letters+signs)" />

var letters=' ABCÇDEFGHIJKLMNÑOPQRSTUVWXYZabcçdefghijklmnñopqrstuvwxyzàáÀÁĆćéèÈÉíìÍÌïÏóòÓÒúùÚÙüÜ'
var numbers='1234567890'
var signs=',.:;@-\''
var mathsigns='+-=()*/'
var custom='<>#$%&?¿'

function allowchar(myfield, e, allow, 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 or letters or..
else if ((allow.indexOf(keychar) > -1))
   return true;

// decimal point jump
else if (dec && (keychar == "."))
   {
   myfield.form.elements[dec].focus();
   return false;
   }
else
   return false;
}

//-->
