diff --git a/index.html b/index.html
index 4ff14e9..bdb1845 100644
--- a/index.html
+++ b/index.html
@@ -1,6 +1,91 @@
 <html>
 	<head>
+		<title>Calendar generator</title>
 	</head>
 	<body>
+		<div id="input">
+			<form id="calendar-input">
+				<label for="start-date">Start date (YYYY-MM-DD):</label>
+				<input name="start-date" id="start-date" type="date" value="2017-01-01" required />
+				
+				<label for="number-of-days">Number of days:</label>
+				<input name="number-of-days" id="number-of-days" type="number" value="1" required />
+				
+				<label for="country-code">Country code (2-digit):</label>
+				<input name="country-code" id="country-code" type="text" value="CR" required />
+				
+				<input id="generate-button" name="generate-button" type="button" value="Generate"/>
+			</form>
+		</div>
+		<div id="output">
+			
+		</div>
+		
+		<script type="text/javascript">
+			//=====
+			
+			var apiKey = "e98ccf69-6131-42ad-a11c-d733698dad63";
+			//Above: test key, will return dummy data but is unlimited
+			//Below: live key, returns actual data but limited per month
+			//Comment/uncomment as necessary, or request a free key at
+			//http://holidayapi.com
+			//var apiKey = "177c7a48-d566-426b-bb50-cf9926f767ec";
+			
+			var generate = function(){
+				var form = document.getElementById("calendar-input");
+				var startDate = document.getElementById("start-date").value;
+				var numberOfDays = document.getElementById("number-of-days").value;
+				var countryCode = document.getElementById("country-code").value;
+				
+				//TODO:
+				//- Count the current day of the week, fill row with
+				//  blanks until reaching the week's Sunday
+				//- Count the current day of the month, break table on
+				//  the last one, fill row with blanks until reaching
+				//  the week's Saturday, generate a new month banner,
+				//  fill new row with blanks from Sunday to that month's
+				//  1st
+				
+				if (validateDate(startDate) && validateNumber(numberOfDays) && validateCountry(countryCode)){
+					//Start loop
+					for (var i = 0; i < numberOfDays; i++){
+						console.log(i);
+						
+						var startYear = parseInt(startDate.substr(0,4));
+						var startMonth = parseInt(startDate.substr(5,2));
+						var startDay = parseInt(startDate.substr(8,2));
+						//TODO: use getDay() to get the week's Sunday (getDay() == 0)
+					}
+				}
+			}
+			
+			function validateDate(dateString){
+				//Validate date, convert to its components
+				if (dateString.length == 10 && dateString[4] == "-" && dateString[7] == "-") {
+					var startYear = parseInt(dateString.substr(0,4));
+					var startMonth = parseInt(dateString.substr(5,2));
+					var startDay = parseInt(dateString.substr(8,2));
+					if (!isNaN(startYear) && !isNaN(startMonth) && isNaN(startDay)) {
+						//Good, we're validated!
+						return true;
+					}
+				}
+				//else:
+				return false;
+			}
+			
+			function validateNumber(num){
+				return !isNaN(parseInt(num));
+			}
+			
+			function validateCountry(countryCode){
+				//TODO: compare with the whole list of countries in the
+				//API
+				return (countryCode.length == 2);
+			}
+			
+			document.getElementById("generate-button").onclick = generate();
+			//=====
+		</script>
 	</body>
 </html>
