function isvalidform(form) {
  if (form.subject.value == "") {
  alert ("Please enter a subject!");
  return false;
 } 

 if (form.message.value == "") {
  alert ("Please enter your message!");
  return false;
 } 

// if everything is ok proceed the form

 return true;
}

function isvalidform_sendurl(form) {
  if (form.from.value == "") {
	switch(form.i18n.value){
		case "en_US": 
			alert ("Please enter your e-mail address!");
			break;
		case "gm_GM": 
		  	alert ("Bitte gib Deine e-mail Adresse an!");
			break;
	}   
    form.from.focus();
  return false;
 } 

 if (form.recipient.value == "") {
	switch(form.i18n.value){
		case "en_US": 
			alert ("Please enter your friends e-mail adress!");
			break;
		case "gm_GM": 
		  	alert ("Bitte gib die e-mail Adresse Deines Freundes an!");
			break;
	}   
    form.recipient.focus();
 return false;
 } 
 
 if (form.message.value == "") {
	switch(form.i18n.value){
		case "en_US": 
			alert ("Please enter your message!");
			break;
		case "gm_GM": 
		  	alert ("Du hast keine Nachricht angegeben!");
			break;
	}   
    form.recipient.focus(); 
  return false;
 } 

// if everything is ok proceed the form

 return true;
}