function valid_register_form(form){
    var mail = /^.+@.+\..{2,4}$/;

    if(form.email.value == ""){ 
       document.getElementById("blok").innerHTML="E-mail address is required."; return false;}
    else if(mail.test(form.email.value) == false){    
       document.getElementById("blok").innerHTML="The e-mail wasn't correct."; return false;} 
    if(form.coEmail.value == ""){        
       document.getElementById("blok").innerHTML="The confirmation e-mail did not match the initial e-mail."; return false;}        
    else if(form.nick.value.length < 5 || form.nick.value.length > 31){ 
       document.getElementById("blok").innerHTML="The nick hasn't got a right length."; return false;}              
    else return true;
}

/* kontrola vložení povídky */
function valid_story_form(form){
  c=document.form.story.value.length;     
     
  if(form.name.value.length < 3){ 
    document.getElementById("blok_1").innerHTML="The story name is too short."; return false;}
  else if(form.author.value.length < 3){       
    document.getElementById("blok_1").innerHTML="The author name is too short."; return false;}      
  else if(c < 500){       
    document.getElementById("blok_1").innerHTML="The story is too short."; return false;}                                
  else return true;   
}

/* kontrola odeslání gallerie */
function valid_send_gallery(form){
    var mail = /^.+@.+\..{2,4}$/;

    if(form.email.value == ""){ 
       document.getElementById("blok").innerHTML="The E-mail wasn't insert."; return false;}
    else if(mail.test(form.email.value) == false){    
       document.getElementById("blok").innerHTML="The e-mail wasn't correct."; return false;}   
    else if(form.gallery.value == ""){ 
       document.getElementById("blok").innerHTML="The Gallery wasn't insert."; return false;} 
    else if(form.recip.value == ""){ 
       document.getElementById("blok").innerHTML="The Reciprocal Link wasn't insert."; return false;}              
    else return true;
}

/* kontrola odesílání a editace message */
function valid_add_edit_message(form){
  c=document.form.text.value.length;     
     
  if(form.message_title.value.length < 3){ 
    document.getElementById("blok").innerHTML="The title is too short."; return false;}   
  else if(c < 3){       
    document.getElementById("blok").innerHTML="The text is too short."; return false;}                                
  else return true;  
}

/* výpočet délky textu */
function over(){
  c=document.form.story.value.length; 
  if(0 < c){
    document.getElementById("blok_2").innerHTML=c;}
}