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 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 if(c > 4000){       
    document.getElementById("blok").innerHTML="The text is too long."; return false;}                                     
  else return true;  
}

/* kontrola vložení title */
function valid_title_form(form){
    if(form.title_clip.value == ""){        
       document.getElementById("blok").innerHTML="Title is required."; return false;}        
    else if(form.year1.value == ""){ 
       document.getElementById("blok").innerHTML="The year must be collected."; return false;}  
    else if(form.cast.value == ""){ 
       document.getElementById("blok").innerHTML="The cast is empty."; return false;}      
    else if(form.text.value == ""){ 
       document.getElementById("blok").innerHTML="The text is empty."; return false;}                           
    else return true;
}

/* kontrola vložení serial */
function valid_serial_form(form){
    if(form.serial.value == ""){        
       document.getElementById("blok").innerHTML="TV-series is required."; return false;}  
    else if(form.year1.value == ""){ 
       document.getElementById("blok").innerHTML="The start of TV-series must be collected."; return false;} 
    else if(form.year2.value == ""){ 
       document.getElementById("blok").innerHTML="The end of TV-series must be collected."; return false;}        
    else if(form.title_clip.value == ""){        
       document.getElementById("blok").innerHTML="Episode is required."; return false;}         
    else if(form.cast.value == ""){ 
       document.getElementById("blok").innerHTML="The cast is empty."; return false;}      
    else if(form.text.value == ""){ 
       document.getElementById("blok").innerHTML="The text is empty."; return false;}                           
    else return true;
}

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

/* zakryje při uploadu input */  
function upload(){  
  document.getElementById("upload").innerHTML="<div class=\"block_1\"><img src=\"http://www.bondagehollywood.com/images/processing.gif\" alt=\"processing\" /><h3 class=\"h3\"><p>Please leave this window open while the upload process completes.<br/> Meanwhile, feel free to open a new browser window and continue using Bondage Hollywood.</p><p>When a lot of people are uploading all at once,<br /> you may have to wait a little while before yours appear on Bondage Hollywood.</p></h3></div>";  
}