function checkEmail(form) {

	if (isBlank(form.email.value) || !isEmailValid(form.email.value) ) {

		alert("Please enter a valid Email Address.\nThe email you have typed in does not appear to be valid.");

		form.email.focus();

		return false;

	}

return true;



}
function isBlank(fieldValue) {

	var blankSpaces = / /g;

	fieldValue = fieldValue.replace(blankSpaces, "");

	return (fieldValue == "") ? true : false;

}



function isEmailValid(fieldValue) {

	var emailFilter = /^.+@.+\..{2,4}$/;

	var atSignFound = 0;

	for (var i = 0; i <= fieldValue.length; i++)

		if ( fieldValue.charAt(i) == "@" )

			atSignFound++;

	if ( atSignFound > 1 )

		return false;

	else

		return ( emailFilter.test(fieldValue) && !doesEmailHaveInvalidChar(fieldValue) ) ? true : false;

}