function maxlength_textarea(id, crid, max)
                        {
                                var txtarea = document.getElementById(id);
                                document.getElementById(crid).innerHTML=max-txtarea.value.length;
                                txtarea.onkeypress=function(){eval('v_maxlength("'+id+'","'+crid+'",'+max+');')};
                                txtarea.onblur=function(){eval('v_maxlength("'+id+'","'+crid+'",'+max+');')};
                                txtarea.onkeyup=function(){eval('v_maxlength("'+id+'","'+crid+'",'+max+');')};
                                txtarea.onkeydown=function(){eval('v_maxlength("'+id+'","'+crid+'",'+max+');')};
                        }
                        function v_maxlength(id, crid, max)
                        {
                                var txtarea = document.getElementById(id);
                                var crreste = document.getElementById(crid);
                                var len = txtarea.value.length;
                                if(len>max)
                                {
                                        txtarea.value=txtarea.value.substr(0,max);
                                }
                                len = txtarea.value.length;
                                crreste.innerHTML=max-len;
                        }