function isEmail(inString){
  var objRE = /^[\w-\.\']{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]{2,}$/;
  return objRE.test(inString);
}

function trim(inString){
   return inString.replace(/^\s*|\s*$/g,"");
}

function OnSubmitForm(){
	err = "";

    if( trim(document.newsletterform.add.value) != "" ){
        if(!isEmail(document.newsletterform.add.value)){
            
            err += "Felaktigt format på e-post\n";
            
            alert(err);
            return false;
        
        }else{
            document.newsletterform.submit();
        }
    }else{
        return false;
    }
}