function check_length(mrt_send_sms_form, maxLen) { if (mrt_send_sms_form.message.value.length > maxLen) { mrt_send_sms_form.message.value = mrt_send_sms_form.message.value.substring(0, maxLen); mrt_send_sms_form.text_num.value = "none"; } else{ mrt_send_sms_form.text_num.value = maxLen - mrt_send_sms_form.message.value.length - 1; } if (mrt_send_sms_form.text_num.value < 1){ mrt_send_sms_form.text_num.value = 0; } } function ismaxlength(obj){ var mlength=obj.getAttribute? parseInt(obj.getAttribute("maxlength")) : "" if (obj.getAttribute && obj.value.length>mlength){ alert('You have reached your maximum limit of characters allowed'); obj.value=obj.value.substring(0,mlength) } }