function nums(obj, e)
{
var inputkey;
var KeyChar;

if (window.event)
{ inputkey = window.event.keyCode; }
else if (e)
{ inputkey = e.which; }
else
{ return true; }
KeyChar = String.fromCharCode(inputkey);

// control keys
if ((("0123456789 ").indexOf(KeyChar) > -1))
{ return true; }
// numbers
else if ((inputkey == null) || (inputkey == 0) || (inputkey == 8) ||
    (inputkey == 9) || (inputkey == 13) || (inputkey == 27))
{ return true; }

else
    {return false;}
}