/**
 *  E-mail validation function
 */
function isEmailValidate ( emailAsSting ) {

  var at="@";
  var dot=".";
  var lat=emailAsSting.indexOf(at);
  var lstr=emailAsSting.length;
  var ldot=emailAsSting.indexOf(dot);

  if (emailAsSting.indexOf(at)==-1){
    return false;
  }

  if (emailAsSting.indexOf(at)==-1 || emailAsSting.indexOf(at)==0 || emailAsSting.indexOf(at)==(lstr-1)){
    return false;
  }

  if (emailAsSting.indexOf(dot)==-1 || emailAsSting.indexOf(dot)==0 || emailAsSting.indexOf(dot)==(lstr-1)){
    return false;
  }

  if (emailAsSting.indexOf(at,(lat+1))!=-1){
    return false;
  }

  if (emailAsSting.substring(lat-1,lat)==dot || emailAsSting.substring(lat+1,lat+2)==dot){
    return false;
  }

  if (emailAsSting.indexOf(dot,(lat+2))==-1){
    return false;
  }

  if (emailAsSting.indexOf(" ")!=-1){
    return false;
  }

  return true;				
}