function check_length(my_form)
{
maxLen = 200; 
if (my_form.description.value.length >= maxLen) {

var msg = "You have reached your maximum limit of characters allowed";
alert(msg);

my_form.description.value = my_form.description.value.substring(0, maxLen);
}
else{ 
my_form.text_num.value = maxLen - my_form.description.value.length;}
}