function ValidaEmail()
{
  var obj = eval("document.forms[0].email");
  var txt = obj.value;
  if ((txt.length != 0) && ((txt.indexOf("@") < 1) || (txt.indexOf('.') < 7)))
  {
    alert('Email incorreto');
	obj.focus();
  }
}

function textCounter(field, countfield, maxlimit) {
if (field.value.length > maxlimit) 
field.value = field.value.substring(0, maxlimit);

else 
countfield.value = maxlimit - field.value.length;
}