//checknewacc.js
//firstname, lastname, email, login, passwd, passwd2, url
function checknewacc(v1,v2,v3,v4,v5,v6){
if(!(v1&&v2&&v3&&v4&&v5&&v6)){
alert("Error: You must fill in all required fields.\nPlease, try again...");
return false; } 
if(v3.indexOf('@',1) == -1 || v3.indexOf('.',3)==-1){
alert("Error: You must enter valid email address.\nPlease, try again...");
return false; } 
if(v5!=v6) { 
alert("Error: Passwords must be identical.\nPlease, try again...");
return false; 
}
if(v5.length<6) { //Here you can change minimal password length: now is 6.
alert("Error: Password must be at least 6 characters.\nPlease, try again...");
return false; 
}
if(v4==v5) {
alert("Error: Username and Password must be different.\nPlease, try again...");
return false;
}
}