// T.I.M. Informatica
function FlipImage(url)
{
    if (window.event.srcElement.tagName == "IMG" ) {
        window.event.srcElement.src = url;
    }
}

function OpenPopup(sUrl) 
{ 
    window.open(sUrl,null,'toolbar=no, status=no, scrollbars=yes, width=680,height=520')
}

function RssStringCheck(sStr)
{
    var sTmp="";
	
	for(var i=0;i<sStr.length;++i)
	{
	    if(sStr[i]!='à')
		sTmp=sTmp+sStr[i];
	    else
		sTmp=sTmp+"a'";
	}

    return sTmp;
}

function encrypt(str, pwd) 
{
  if(pwd == null || pwd.length <= 0) {
    alert("Please enter a password with which to encrypt the message.");
    return null;
  }
  var prand = "";
  for(var i=0; i<pwd.length; i++) {
    prand += pwd.charCodeAt(i).toString();
  }
  var sPos = Math.floor(prand.length / 5);
  var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos*2) + prand.charAt(sPos*3) + prand.charAt(sPos*4) + prand.charAt(sPos*5));
  var incr = Math.ceil(pwd.length / 2);
  var modu = Math.pow(2, 31) - 1;
  if(mult < 2) {
    alert("Algorithm cannot find a suitable hash. Please choose a different password. \nPossible considerations are to choose a more complex or longer password.");
    return null;
  }
  var salt = Math.round(Math.random() * 1000000000) % 100000000;
  prand += salt;
  while(prand.length > 10) {
    prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
  }
  prand = (mult * prand + incr) % modu;
  var enc_chr = "";
  var enc_str = "";
  for(var i=0; i<str.length; i++) {
    enc_chr = parseInt(str.charCodeAt(i) ^ Math.floor((prand / modu) * 255));
    if(enc_chr < 16) {
      enc_str += "0" + enc_chr.toString(16);
    } else enc_str += enc_chr.toString(16);
    prand = (mult * prand + incr) % modu;
  }
  salt = salt.toString(16);
  while(salt.length < 8)salt = "0" + salt;
  enc_str += salt;
  return enc_str;
}

function decrypt(str, pwd) 
{
  if(str == null || str.length < 8) 
{
    alert("A salt value could not be extracted from the encrypted message because it's length is too short. The message cannot be decrypted.");
    return;
  }
  if(pwd == null || pwd.length <= 0) 
{
    alert("Please enter a password with which to decrypt the message.");
    return;
  }
  var prand = "";
  for(var i=0; i<pwd.length; i++) 
{
    prand += pwd.charCodeAt(i).toString();
  }
  var sPos = Math.floor(prand.length / 5);
  var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos*2) + prand.charAt(sPos*3) + prand.charAt(sPos*4) + prand.charAt(sPos*5));
  var incr = Math.round(pwd.length / 2);
  var modu = Math.pow(2, 31) - 1;
  var salt = parseInt(str.substring(str.length - 8, str.length), 16);
  str = str.substring(0, str.length - 8);
  prand += salt;
  while(prand.length > 10) 
{
    prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
  }
  prand = (mult * prand + incr) % modu;
  var enc_chr = "";
  var enc_str = "";
  for(var i=0; i<str.length; i+=2) 
{
    enc_chr = parseInt(parseInt(str.substring(i, i+2), 16) ^ Math.floor((prand / modu) * 255));
    enc_str += String.fromCharCode(enc_chr);
    prand = (mult * prand + incr) % modu;
  }
  return enc_str;
}