function checkLength(oObject, maxLength)
{
    if (oObject.value.length<maxLength)
        return true;
    else
    {
        if ((event.keyCode>=37 && event.keyCode<=40) || (event.keyCode==8) || (event.keyCode==46))
        {
            event.returnValue = true;
        }
        else
        {
            oObject.value = oObject.value.substring(0,maxLength);

            event.returnValue = false;
        }
    }

}