// JScript source code
function getKeyCode(e)
{
	if (window.event)
                return window.event.keyCode;
    else if (e)
                return e.which;
    else
                return null;
}
                                    
function keyRestrict(e, validchars) {
	var key='', keychar='';
    key = getKeyCode(e);
    if (key == null) return true;
    keychar = String.fromCharCode(key);
    keychar = keychar.toLowerCase();
    validchars = validchars.toLowerCase();
    if (validchars.indexOf(keychar) != -1)
		return true;
    if ( key==null || key==0 || key==8 || key==9 || key==13 || key==27 )
		return true;
    return false;
}