var supportsKeys = false
var maxLength
function textKey(f)
{
    supportsKeys = true
    calcCharLeft(f)
}
function calcCharLeft(f)
{
    maxLength = 500;
        if (f.mesaj.value.length > maxLength){
          f.mesaj.value = f.mesaj.value.substring(0,maxLength)
        charleft = 0
        } else {
      charleft = maxLength - f.mesaj.value.length
    }
        f.harf.value = charleft
}