function TwitterDisplay(operation, criteria, resultsPerPage, containerId, callback, tagLabel) {
	this.operation = jQuery.trim(operation);
	this.criteria = jQuery.trim(criteria);
	this.resultsPerPage = resultsPerPage;
	this.containerId = containerId;
	this.callback = callback;
	this.currentPage = 0;
	this.totalPages = 500;
	if(tagLabel) {
		this.tagLabel = tagLabel;
	} else {
		this.tagLabel = "Tag(s) : ";
	} 
	if(operation == 'statuses') {
		this.requestURL = "http://twitter.com/statuses/user_timeline/" + this.criteria + ".json";
		this.nextPageUrlSuffix = "?page=1&count=" + this.resultsPerPage
		
	} else {
		this.requestURL = "http://search.twitter.com/search.json";
		this.nextPageUrlSuffix = "?page=1&rpp=" + this.resultsPerPage + "&q=" + this.criteria;

	}
	this.prevPageUrlSuffix = "";
}

/*
TwitterDisplay.prototype.displayNextPage = function() {
	if(this.currentPage < this.totalPages) {
		this.currentPage = parseInt(this.currentPage) + 1 ;
		var requestURL = this.requestURL + this.nextPageUrlSuffix + "&rand=" + parseInt(Math.random()*99999999) + "&callback=?" ;
		$.getJSON(requestURL, this.callback);
	}
	
}*/
TwitterDisplay.prototype.displayNextPage = function(){
	if (this.nextPageUrlSuffix != "") {
		this.currentPage = parseInt(this.currentPage) + 1;
		var requestURL = this.requestURL + this.nextPageUrlSuffix + "&rand=" + parseInt(Math.random() * 99999999) + "&callback=?";
		$.getJSON(requestURL, this.callback);
		$("#" + this.containerId).html("<div class='ajaxLoading'>Loading ...</div>");
	}
}	
/*
TwitterDisplay.prototype.displayPrevPage = function() {
	if(this.currentPage > 1) {
		this.currentPage = parseInt(this.currentPage) - 1;
		var requestURL = this.requestURL + this.prevPageUrlSuffix + "&rand=" + parseInt(Math.random()*99999999) + "&callback=?" ;
		$.getJSON(requestURL, this.callback);
	}	
}*/

TwitterDisplay.prototype.displayPrevPage = function() {
if(this.prevPageUrlSuffix != "") {
	this.currentPage = parseInt(this.currentPage) - 1;
		var requestURL = this.requestURL + this.prevPageUrlSuffix + "&rand=" + parseInt(Math.random()*99999999) + "&callback=?" ;
		$.getJSON(requestURL, this.callback);
		$("#" + this.containerId).html("<div class='ajaxLoading'>Loading ...</div>");
	}	
}

TwitterDisplay.prototype.displayTweets = function(json, status) {

		var jsonRoot = json;
		var container = $("#" + this.containerId);
		
		if(json.error) {
			container.html(json.error);
			return;
		}
		if(json.results) {
			json = json.results;
		} else if(json[0].user && json[0].user.statuses_count) {
			this.totalPages = Math.ceil(json[0].user.statuses_count/this.resultsPerPage);
		}
		container.html("");
		var usedCriteria = unescape(this.criteria);
		if(usedCriteria.indexOf("#") == 0) {
			container.append("<div class='followTag'><span class='label'>" + this.tagLabel + "</span>" 
			+ unescape(this.criteria) + "</div>");
		}
		container.append("<ul class='tweetsHolder'></ul>");
		
		holder = $("#" + this.containerId + " .tweetsHolder");
		$.each(json, function(i, item){
		
			var styleString = "";
			var userId = item.user ? item.user.screen_name : item.from_user;
			var userText = userId;
			var followText = "";
			if(TwitterMap[userId]) {
				userObj = TwitterMap[userId];
				styleString = ' style="color: ' + userObj.color + ';" ';
				userText = '<a class="username"' + styleString + 'href="' + userObj.profileUrl + '">' +
				userObj.name + '</a>';
				
				followText = '<div class="follow">' +
				'<a target=_new href="http://twitter.com/' + userId + '">Follow ' +
				userObj.name + '</a></div>';
			} 	
			
			tweet = item.text.twitterize();
			holder.append("<li class=\"tweets\">" + 

			'<div class="userInfo">' + userText + '</div>' +
			'<div class="message">' + tweet + '</div>' +
			"<div class='created'" + styleString + ">" + "..." +
			item.created_at.fixTwitterDateString() + "</div>" +
			followText +
			"</li>");
		});
		if (jsonRoot.previous_page) {
			this.prevPageUrlSuffix = jsonRoot.previous_page;
			this.setPrevNavigation(true);
			
		} else if(this.operation == 'statuses' && this.currentPage > 1) {
			this.prevPageUrlSuffix = "?page=" + (this.currentPage - 1) + "&count=" + this.resultsPerPage;
			this.setPrevNavigation(true);
			
		} else {
			this.prevPageUrlSuffix = "";
			this.setPrevNavigation(false);
		}
		
		if (jsonRoot.next_page) {
			this.nextPageUrlSuffix = jsonRoot.next_page;
			this.setNextNavigation(true);
			
		} else if(this.operation == 'statuses' && this.currentPage < this.totalPages) {
			this.nextPageUrlSuffix = "?page=" + (this.currentPage + 1) + "&count=" + this.resultsPerPage;
			this.setNextNavigation(true);
			
		} else {
			this.nextPageUrlSuffix = "";
			this.setNextNavigation(false);
		}
		
}
 

TwitterDisplay.prototype.setNextNavigation = function(enabled) {

	var id = "#" + this.containerId + "Next";
	if(enabled) {
		$(id).removeClass('tcNextDisabled');
		$(id).addClass('tcNextEnabled');
		$(id).attr('href', '#');
	} else {
		$(id).removeClass('tcNextEnabled');
		$(id).addClass('tcNextDisabled');
		$(id).attr('href', 'javascript:void(0)');
	}
}


TwitterDisplay.prototype.setPrevNavigation = function(enabled) {

	var id = "#" + this.containerId + "Prev";
	if(enabled) {
		$(id).removeClass('tcPreviousDisabled');
		$(id).addClass('tcPreviousEnabled');
		$(id).attr('href', '#');
	} else {
		$(id).removeClass('tcPreviousEnabled');
		$(id).addClass('tcPreviousDisabled');
		$(id).attr('href', 'javascript:void(0)');
	}
}


function delegateTwitterCallback (twitterDisplay, json, status) {
	twitterDisplay.displayTweets(json, status);
}
 

        
String.prototype.twitterize = function() {
	
    var tweet = this.replace(/[A-Za-z]+:\/\/[A-Za-z0-9-_]+\.[A-Za-z0-9-_:%&\?\/.=]+/, function(str){
        return '<a class="extLink" target=_new href="' + str + '">' + str + '</a>';
    });
	
    tweet = tweet.replace(/([@])([\w]+)/g, '$1<a class="twitterLink" target=_new href="http://twitter.com/' + '$2'.toLowerCase() + '">$2</a>');
	
	
	return tweet;
};

String.prototype.fixTwitterDateString = function() {
	
    var dateArray = this.split(" ");
    var tweetDateString;

    if(parseInt(dateArray[1], 10) > 0) {
   	tweetDateString = dateArray[2] + " " + dateArray[1] + ", " + dateArray[3] + " " + dateArray[4];
    } else {
 	tweetDateString = dateArray[1] + " " + dateArray[2] + ", " + dateArray[5] + " " + dateArray[3];
    }

    var tweetTime = Date.parse(tweetDateString);
    var currDate = new Date();
    
    var timeDiff = parseInt(currDate.getTime() - tweetTime) / 1000;
    timeDiff = timeDiff + (currDate.getTimezoneOffset() * 60);               
	
	var formattedString = '';
    if (timeDiff < 60) {
        formattedString = 'a minute ago';
    }
    else if (timeDiff < (45 * 60)) {
        formattedString = Math.round(timeDiff / 60) + ' minutes ago';
    }
    else if (timeDiff < (1.5 * 60 * 60)) {
        formattedString = '1 hour ago';
    }
    else if (timeDiff < (24 * 60 * 60)) {
   	formattedString = Math.round(timeDiff / (60 *60)) + ' hours ago';
    }
    else if (timeDiff < (1.5 * 24 * 60 * 60)) {
      	formattedString = '1 day ago';
    }
    else if (timeDiff < (7 * 24 * 60 * 60)) {
      	formattedString = Math.round(timeDiff / (24 * 60 * 60)) + ' days ago';
    }
    else if (timeDiff < (1.5 * 7 * 24 * 60 * 60)) {
       	formattedString = '1 week ago';
    }
    else if (timeDiff < (4 * 7 * 24 * 60 * 60)) {
	formattedString = Math.round(timeDiff / (7 * 24 * 60 * 60)) + ' weeks ago';
    }
    else if (timeDiff < (1.5 * 4 * 7 * 24 * 60 * 60)) {
	formattedString = '1 month ago';
    }
    else if (timeDiff < (12 * 4 * 7 * 24 * 60 * 60)) {
	formattedString = Math.round(timeDiff / (4 * 7 * 24 * 60 * 60)) + ' months ago';
    }
    else if (timeDiff < (1.5 * 12 * 4 * 7 * 24 * 60 * 60)) {
	formattedString = '1 year ago';
    } 
    else if (timeDiff > (1.5 * 12 * 4 * 7 * 24 * 60 * 60)) {
	formattedString = Math.round(timeDiff / (12 * 4 * 7 * 24 * 60 * 60)) + ' years ago';
    }
    else {
	formattedString = tweetDateString;
    }
    return formattedString;
}