var fieldVal = null;

function ValComment()
{
	errors = new Array();
	errors[0] = checkName("name", 1);
	errors[1] = checkWebsite("website", 0);
	errors[2] = checkTextarea("postComment", 1);
	errors[3] = checkEmail("email", 1);
	if (searchErrors(errors) == 0) {
		document.getElementById('comSubBut').innerHTML = "Posting Comment...";
		addComment();
	}

}

var XMLHttpRequestObject=null;

function GetXmlHttpObject()
{ 
	if (window.XMLHttpRequest)
	{
		XMLHttpRequestObject=new XMLHttpRequest();
	}
	else if (window.ActiveXObject)
	{
		XMLHttpRequestObject=new ActiveXObject("Microsoft.XMLHTTP");
	}
	return XMLHttpRequestObject;
} 

function addComment() {
	var myForm = document.getElementById('commentForm');
	var params = "";
	var formLength = myForm.elements.length;
	var thisFieldVal;
	var thisFieldID;
	for (i=0;i<formLength;i++) {
		
		thisFieldID = myForm.elements[i].id;
		thisFieldVal = document.getElementById(thisFieldID).value;
		if (thisFieldVal != "") {
			params += "&"+thisFieldID+"="+encodeURI(thisFieldVal);
		}
	}
	parameters = params.substr(1);

	http_request = false;
	http_request = new GetXmlHttpObject();
	if (http_request.overrideMimeType) {
		// set type accordingly to anticipated content type
		http_request.overrideMimeType('text/html');
	}
	if (!http_request) {
		alert('Cannot create XMLHTTP instance');
		return false;
	}
	
	http_request.onreadystatechange = function()
	{
		if (XMLHttpRequestObject.readyState==4 || XMLHttpRequestObject.readyState=="complete")
		{ 
			changeHTML("/listBlogComments?post_id="+document.getElementById('postID').value, 'commentsArea'); 
			var curComNum = document.getElementById('thisCommentNum').innerHTML;
			curComNum = curComNum.parseInt();
			curComNum++;
			document.getElementById('thisCommentNum').innerHTML = curComNum;
		};
	}
	var url = '/postBlogComment';
	http_request.open('POST', url, true);
	http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http_request.setRequestHeader("Content-length", parameters.length);
	http_request.setRequestHeader("Connection", "close");
	http_request.send(parameters);
	
}

function changeHTML(dataSource, divID, clear) 
{ 
	XMLHttpRequestObject= new GetXmlHttpObject();
	if (XMLHttpRequestObject) {
		if (divID != "") var obj = document.getElementById(divID);
		XMLHttpRequestObject.open("GET", dataSource);
		
		XMLHttpRequestObject.onreadystatechange = function()
		{
			if (XMLHttpRequestObject.readyState==4 || XMLHttpRequestObject.readyState=="complete")
			{ 
				if (divID != "") obj.innerHTML = XMLHttpRequestObject.responseText;
				if (clear) if (clear == "yes") setTimeout("clearClay()", 1500);
			} 
		
		}
		
		XMLHttpRequestObject.send(null);
	}
	
}


function checkEmail(fieldName, required)
{
	if (document.getElementById(fieldName) != null) fieldVal = document.getElementById(fieldName).value;	
	else fieldVal = "";
	
	innerVal = "";
	
	if (fieldVal != "" && fieldVal != null && fieldVal != "undefined")
	{
		if (!fieldVal.match(/^[A-Za-z0-9_\.-]+@[A-Za-z0-9_\.-]+\.[A-Za-z0-9_-]+$/))
			innerVal = "You must enter a valid e-mail.";
	}
	else 
		if (required == 1) innerVal = "Required Field.";
	
	document.getElementById(fieldName+'Error').innerHTML = innerVal;
	return innerVal;
}

function checkName(fieldName, required)
{
	if (document.getElementById(fieldName) != null) fieldVal = document.getElementById(fieldName).value;	
	else fieldVal = "";
	innerVal = "";
	
	if (fieldVal != "" && fieldVal != null && fieldVal != "undefined")
	{
		if (!fieldVal.match(/^[A-Za-z\'\. -]+$/))
			innerVal = "Only letters, apostrophes, periods, and dashes may be used.";
	}
	else 
		if (required == 1) innerVal = "Required Field.";

	document.getElementById(fieldName+'Error').innerHTML = innerVal;
	return innerVal;
}


function checkTextarea(fieldName, required)
{
	if (document.getElementById(fieldName) != null) fieldVal = document.getElementById(fieldName).value;	
	else fieldVal = "";
	innerVal = "";
	
	if (fieldVal != "" && fieldVal != null && fieldVal != "undefined")
	{
		if (fieldVal.match(/[\\\<\>]+/))
			innerVal = "Backslashes, greater than and less then signs are not allowed.";
	}
	else 
		if (required == 1) innerVal = "Required Field.";

	document.getElementById(fieldName+'Error').innerHTML = innerVal;
	return innerVal;
}

function checkWebsite(fieldName, required)
{
	if (document.getElementById(fieldName) != null) fieldVal = document.getElementById(fieldName).value;	
	else fieldVal = "";
	var innerVal = "";
	
	if (fieldVal != "" && fieldVal != null && fieldVal != "undefined")
	{
		if (!fieldVal.match(/^http:\/\/[A-Za-z0-9_\.=&?!:;,'/ -]*$/))
			innerVal = "Must begin with http://";
	}
	else 
		if (required == 1) innerVal = "Required Field.";
		
	handleErrorDIVs(fieldName, innerVal);
	return innerVal;
}

function handleErrorDIVs (fieldName, innerVal) {
	var errorName = fieldName+'Error';
	if (document.getElementById(errorName )) {
		var errorObj = document.getElementById(errorName);
		if (innerVal == "") errorObj.style.display = 'none';
		else {
			errorObj.innerHTML = innerVal;
			errorObj.style.display = 'block';
		}
	}
}

function searchErrors(errors)
{
	errorsExist = 0;
	for (i=0;i<errors.length;i++)
	{
		if (errors[i] != "")
		{
			errorsExist = 1;
			break;	
		}
	}
	return errorsExist;
}