function count_total_char(){
	var max_char = 160;
	var input_char;
	var total_char;
	input_char = document.getElementById("txt_sms_message").value;
	total_char = input_char.length;
	if(total_char > max_char){
		input_char = input_char.substring(0,max_char);	
		document.getElementById("txt_sms_message").value = input_char;
		total_char = input_char.length;
	}
	
	if(total_char == max_char){
		total_char = "Max length of your SMS is " + max_char + " characters!"	
	}
	
	document.getElementById("total_char").innerHTML = total_char;
}

function do_reset_sms_form(){
	document.getElementById("txt_phone_number").value = "";
	document.getElementById("txt_sms_message").value = "";
	document.getElementById("txt_code").value = "";
	count_total_char();
}