// copyright 1999 Idocs, Inc. http://www.idocs.com
// Distribute this script freely but keep this notice in place
// usage: <input type="text" onkeypress="return NumbersOnly(this,event);" name="txtName">
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;
}