var f = document.getElementById('commentform');

f.onsubmit = function() {return checkContactForm();}

function checkContactForm() {

	 author   =   document.getElementById('author');
	 email    =   document.getElementById('email');
	 comment  =   document.getElementById('comment');

	 if ( author.value == "")
	 {
			 author.focus();
			 author.className = 'ierror';
			 alert('Please enter your name.');
			 return false;
	 }
	 else
	 {
			 author.className = 'iok';
	 }

	 if ( email.value == "")
	 {
			 email.focus();
			 email.className = 'ierror';
			 alert('Please enter your email.');
			 return false;
	 }
	 else
	 {
			 /* Check the email */
			 if ( (email.value.indexOf(".") > 2) && (email.value.indexOf("@") > 0) )
			 {
					email.className = 'iok';
			 }
			 else
			 {
					 email.focus();
					 email.className = 'ierror';
					 alert('Please enter a valid email.');
					 return false;
			 }
	 }

	 if ( comment.value == "" )
	 {
			 comment.focus();
			 comment.className = 'ierror';
			 alert('Please enter your comment.');
			 return false;
	 }
	 else
	 {
			 comment.className = 'iok';
	 }

	 /* if we still here.. return true */
	 return true;

}