JavaScript to validate a control with multiple email addresses

	// Replacing commas from email address and removing extra spaces at beginning and end of email addresses

	var input = [Email Address];
	var comma = input.replace(/,/g,";");
	var spacesemicolon = comma.replace(/ ;/g,";");
	var semicolonspace = spacesemicolon.replace(/; /g,";");

	// Splitting the string into an array of separate email addresses on semicolon
	var emailarray = semicolonspace.split(";");

    // Validating each item within the array
	for (i = 0; i < emailarray.length ; i++)
	{
	var validate = emailarray[i];
	var bademail = validate.search( /[A-Za-z0-9_.-]+@[A-Za-z0-9_.-]+\.[A-Za-z0-9_.-]+/gi);

	if (bademail != 0)
	{
	alert('Invalid email address entered');
    // if an invalid email address is entered then the value of bademail will be greater than 1 or -1. return; will then stop the code running
	return;
	}
	}