function Counter(textarea, counterID, maxLen)
{
cnt = document.getElementById(counterID);
if(textarea.value.length > maxLen)
{
textarea.value = textarea.value.substring(0,maxLen);
}
cnt.innerHTML = maxLen - textarea.value.length;
}
function UpdateImage()
{
document.getElementById('captcha').src='./php/captcha.php?'+Math.random();
}