function submitForm(form) {
	if (checkIt(form)) {
		form.submit();
  	}
}

function checkIt(form) {
	//var name = formf.chat_name.value;
	var email = form.chat_email.value;
	var question = form.question.value;
	var lib = form.library.value;
	var msg = '';

	//Display error message if library hidden field is blank. 
	/*
	if(lib.length < 1) {
		alert("Your library has an error in this form. Please contact the library to alert them to the problem\r\n");
		return false;
	}
	*/
	//If e-mail field isn't blank, use emailCheck function to validate e-mail syntax.
	if(email.length > 0) {
		if (!emailCheck(email, true)) {      
			return false;
		}
	}
	
	if(question.length < 1) {
		alert("La consulta debe rellenarse\r\n");
		return false;
	}

	return true;
}

function emailCheck (emailStr, alertflag) {	
	var emailPat=/^(.+)@(.+)$/	
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"	
	var validChars="\[^\\s" + specialChars + "\]"
	var quotedUser="(\"[^\"]*\")"
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
	var atom=validChars + '+'		
	var word="(" + atom + "|" + quotedUser + ")"		
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$")		
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
		
	var matchArray=emailStr.match(emailPat)
	if (matchArray==null) {
		if (alertflag)
			alert("El correo electr\u00F3nico parece incorrecto (comprueba @ y puntos).")
		return false
	}
	var user=matchArray[1]
	var domain=matchArray[2]

	// See if "user" is valid 
	if (user.match(userPat)==null) {
		// user is not valid
		if (alertflag) 
			alert("El correo electr\u00F3nico parece incorrecto (comprueba @ y puntos).")
		return false
	}

	/* if the e-mail address is at an IP address (as opposed to a symbolic
	   host name) make sure the IP address is valid. */
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null) {
		// this is an IP address
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				if (alertflag)
					alert("La direcci\u00F3n IP no es correcta.")
				return false
			}
		}
		return true
	}

	// Domain is symbolic name
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
		if (alertflag)
			alert("El correo electr\u00F3nico parece incorrecto (comprueba @ y puntos).")
		return false
	}
	
	var atomPat=new RegExp(atom,"g")
	var domArr=domain.match(atomPat)
	var len=domArr.length
	musExp = /.museum/
	isMus = domain.search(musExp)

	if ( ( (domArr[domArr.length-1].length < 2) || (domArr[domArr.length-1].length > 6) ) ||
		(domArr[domArr.length-1].length == 5) ||
		( (domArr[domArr.length-1].length == 6) && (isMus == -1) ) ) {
			// the address must end in a two, three, or four letter word or .museum
			if (alertflag) 	
				alert("El correo electr\u00F3nico parece incorrecto (comprueba @ y puntos).")
			return false
	}

	// Make sure there's a host name preceding the domain.
	if (len<2) {
		var errStr="El correo electr\u00F3nico parece incorrecto (comprueba @ y puntos)."
		if (alertflag) 
			alert(errStr)
		return false
	}

	// If we've gotten this far, everything's valid!
	return true;
}