function url_check(e)
{
  var charCode = (navigator.appName == "Netscape") ? e.which : e.keyCode
  if ((charCode < 13 || charCode > 13) && (charCode < 46 || charCode > 58) && (charCode < 65 || charCode > 90) && (charCode < 97 || charCode > 122) && (charCode < 126 || charCode > 126))
  {
    alert("Please enter only AlphaNumerics(a-z, A-Z, 0-9, ., :, /,~)")
    return false
  }
  return true
}

function un_pw_check(e)
{
  var charCode = (navigator.appName == "Netscape") ? e.which : e.keyCode
  if ((charCode < 13 || charCode > 13) && (charCode < 45 || charCode > 45) && (charCode < 48 || charCode > 57) && (charCode < 65 || charCode > 90) && (charCode < 95 || charCode > 95) && (charCode < 97 || charCode > 122))
  {
    alert("Please enter only AlphaNumerics(a-z, A-Z, 0-9, _, -)")
    return false
  }
  return true
}