/*
		-rotation
		---------------------
		This is meant to be used in the right column, between the ad banners. It is hoped implementation will be as simple as pasting the following line into the HTML:
		
		<script language="JavaScript" type="text/javascript" src="/js/homepage-logo-rotation.js"></script>
		
		Note that this is located in the root of the website, to facilitate simultaneous use by multiple sub-directories (lasvegas, newyork, etc) if so desired.
		

	*/
	
	// Initialize the arrays:
	var homepage_img = new Array();
	var homepage_preloader = new Array();
	var homepage_text = new Array();
	
	// Declare variables for use as the beginning and close of the image source paths:
	var homepage_img_path = "/boston/js/images/";
	var homepage_img_ext = ".jpg";
	
	// This will be incremented and used as the number of the array elements that follow:
	var x = 0;
	
	// To add a new item to the array, copy the 4 lines that constitute one full item.
	// Once copied, increment the [number] of the array by one, and change the values 
	// as appropriate.
	// 
	// Here is what each line does:
	// --------------------------------------------------------------------------------
	// - First item is the descriptive text to appear above the logo.
	// - Second, the name of the image to use.
	// - Third is the width and height respectively of the image.
	// - Fourth increments the variable 'x' by 1. This needs no editing, but must be present for each item. We use 
	//   this instead of hard-coding the numbers of the array elements (ie: [0], [1], [2], etc) because often 
	//   marketing is going to need to swap in and out new items. If we hard-coded the number of the array 
	//   elements, and someone wanted to squeeze a new homepage between items 3 and 4, the old 4 becomes 5, old 5 
	//   becomes 6, and so on. This way we don't have to manually update that every time a change is requested.

		homepage_img[x] = "1";
		homepage_preloader[x] = new Image(220,146);
		//homepage_preloader[x] = new Image(500,333);
		homepage_text[x] = "";
		x = x + 1;
		
		homepage_img[x] = "2";
		homepage_preloader[x] = new Image(220,146);
		homepage_text[x] = "";
		x = x + 1;
		
		homepage_img[x] = "3";
		homepage_preloader[x] = new Image(220,146);
		homepage_text[x] = "";
		x = x + 1;
		
		homepage_img[x] = "4";
		homepage_preloader[x] = new Image(220,146);
		homepage_text[x] = "";
		x = x + 1;
		
		homepage_img[x] = "5";
		homepage_preloader[x] = new Image(220,146);
		homepage_text[x] = "";
		x = x + 1;
		
		

// We need to pre-load the images in the array above, to minimize delays in display which could set the 
	// associated text out of synch with the logos as they are swapped.
	// 
	// Since homepage_preloader[0].src will be exactly the same as homepage_preloader[100].src with the exception 
	// of the number of the array (0 vs. 100 in the example), we can use the following loop to write this 
	// entire section of the array for us.
	// 
	for (i=0; i<homepage_preloader.length; i++) {
		homepage_preloader[i].src = homepage_img_path + homepage_img[i] + homepage_img_ext;
	}
	
	
	// This is the timer function:
	var homepage_k = 0;
	var timer = setTimeout("changePic()",4000); // 3000 = 3 second delay between items

	function changePic() {
		homepage_k = homepage_k+1;
		if(homepage_k == homepage_text.length) { // the max no. of times to loop is keying off the length of 'homepage_text()'
			homepage_k = 0;
		}
		
		// Insert text description
		document.getElementById('homepage_text_rotation').innerHTML = homepage_text[homepage_k];

        // Insert image source
		document.getElementById('homepage_img_rotation').src = homepage_img_path + homepage_img[homepage_k] + homepage_img_ext;	
		

		
		time = setTimeout("changePic()",4000); // 3000 = 3 second delay between items
	}
	
	
	// Below, we write the entire UI, including the CSS, in JavaScript. If a user does not have JavaScript 
	// turned on, they won't see anything at all.
	
	var homepage_img_ui = ""; // initialize
	homepage_img_ui += "	<div id='homepage_img_ui'>";
	homepage_img_ui += "		<img src='" + homepage_img_path + homepage_img[0] + homepage_img_ext + "' alt='' border='0' id='homepage_img_rotation' style='margin-left:5px;' />";
	homepage_img_ui += "		<div id='homepage_text_rotation'>" + homepage_text[0] + "</div>";
	homepage_img_ui += "	</div>";
	
	
	// Write the UI elements:
	document.write(homepage_img_ui);