Line 20, Column 12: character "&" is the first character of a delimiter but occurred as data .

onsubmit="return validateForm() && validateMessage();">

This message may appear in several cases:
* You tried to include the "<" character in your page: you should escape it as "&lt;"
* You used an unescaped ampersand "&": this may be valid in some contexts, but it is recommended to use "&amp;", which is always safe.
* Another possibility is that you forgot to close quotes in a previous tag.

function validation()
{
  return (valdiateForm() && validateMessage());
}