// JavaScript Document


function checkC(){
	//check textarea length
	//alert(document.contact.msg.value.length);
	
	if((250 - document.contact.msg.value.length) >0){
		document.getElementById('msgleft').innerHTML = "Number of characters left: " + (249 - document.contact.msg.value.length);
	}
	else{
		document.contact.msg.value = document.contact.msg.value.substr(0,250);
	}
}

function val(){
	//validate form
	document.getElementById('error').innerHTML = "";
	if(isEmpty(document.contact.specialist.value)){
		document.getElementById('error').innerHTML = "Please enter your Specialty!"; 
		document.contact.specialist.focus();
		return false;	
	}
	
	if(isEmpty(document.contact.name.value)){
		document.getElementById('error').innerHTML = "Please enter your name!"; 
		document.contact.name.focus();
		return false;	
	}
	
	if(isEmpty(document.contact.email.value)){
		document.getElementById('error').innerHTML = "Please enter your email address!"; 
		document.contact.email.focus();
		return false;	
	}
	
	if(!isValidEmail(document.contact.email.value)){
		document.getElementById('error').innerHTML = "Please enter valied email address!"; 
		document.contact.email.focus();
		return false;	
	}
	
	
	return true;
}

// Checks to see if form element is empty 
function isEmpty(val){
	if (val.match(/^s+$/) || val == ""){
		return true;
	}
	else{
		return false;
	} 
}



function isDigit(n) { //check it is digit or not
	if((n < "0") || ("9" < n)) {
		return false
	} 
	else {
		return true
	}
}

//--------------------------- validate email
function isValidEmail(email, required) {
    if (required==undefined) {   // if not specified, assume it's required
        required=true;
    }
    if (email==null) {
        if (required) {
            return false;
        }
        return true;
    }
    if (email.length==0) {  
        if (required) {
            return false;
        }
        return true;
    }
    if (! allValidChars(email)) {  // check to make sure all characters are valid
        return false;
    }
    if (email.indexOf("@") < 1) { //  must contain @, and it must not be the first character
        return false;
    } else if (email.lastIndexOf(".") <= email.indexOf("@")) {  // last dot must be after the @
        return false;
    } else if (email.indexOf("@") == email.length) {  // @ must not be the last character
        return false;
    } else if (email.indexOf("..") >=0) { // two periods in a row is not valid
	return false;
    } else if (email.indexOf(".") == email.length) {  // . must not be the last character
	return false;
    }
    return true;
}

function allValidChars(email) {
  var parsed = true;
  var validchars = "abcdefghijklmnopqrstuvwxyz0123456789@.-_";
  for (var i=0; i < email.length; i++) {
    var letter = email.charAt(i).toLowerCase();
    if (validchars.indexOf(letter) != -1)
      continue;
    parsed = false;
    break;
  }
  return parsed;
}