function validate_email(field,alerttxt)
{
with (field)
{
apos=value.indexOf("@")
dotpos=value.lastIndexOf(".")
if (apos<1||dotpos-apos<2) 
  {
	  document.getElementById("feedback").className = "show"; 
	  document.getElementById("feedback").innerHTML = alerttxt;
  return false}
else {return true}
}
}