/*
	Name:		Scott Ash JS Menu Image Swap
	Type:		Object
	Created:	03/03/2005
	Modified:	03/03/2005
	Version:	2.0
	Updates:	12/20/2004 (v1.0)
					first release into build of a website.
				05/10/2005
					updated function to be object oriented. Still has very specific calls that may be updated
					in the future.
	Author:		Scott A. Ash
	Copyright:	Scott Ash
	Functions:	bpi_prod_photos()
				
				init():
				This function swaps the image of a target window for previewing photos. It also loads an 
				arrow image based on the thumbnail image name.
				
				The function takes two parameters being the target image name and the number of photos that will
				be set for preview.
				
				Example thumnail file name:				[target name]_[xx]_t.jpg
				Example matching photo file name:		[target name]_[xx].jpg
				Example thumnail image call				<img onmousedown="[object].setview([xx])" src"[...]">
				
				Where "target name" is the first part of the filename and also the name & id of the preview window in
				the html. "xx" represents an integer value from 0-99.
					
	Uses:		solo
	Required:	This is a very specific function. It requires that the preview box be build as it is in this 
				website.
				
	Settings:	None
*/


function bpi_prod_photos()
{
	// members
	this.target;
	this.len;
	
	this.init = init;
	this.setview = setview;

	// constructor
	function init(t,l)
	{
		this.target = t;
		this.len = l;
	}
	
	function setview(n)
	{
		// initialize number
		imgnum = n;
		if(n<10)
		{
			arrowname = "a0" + n;
			imgnum = "0" + n;
		}else
		{
			arrowname = "a" + n;
			imgnum = n;
		}
		
		
		arrowsrc = document[arrowname].src;
		arrowsrcparts = arrowsrc.split('arrow');	// requires file name to start with "arrow"
	
		
		// test for image swap ability
		var isAllowed = (document.images);
		
		if(isAllowed)
		{
			// reset all arrows to blanks
			for(i=0;i<this.len;i++)
			{	
				document['a0' + i].src = arrowsrcparts[0] + 'arrows/arrow_blank.gif';
			}
			
			// swap target image
			document[this.target].src = "prod_photos/" + this.target + '_' + imgnum + '.jpg';
			
			// load red arrow to current image
			document[arrowname].src = arrowsrcparts[0] + 'arrows/arrow_down.gif';
			
		}else
		{
			alert("ERROR!\nbpi_prod_photos():\nYour browser does not support image swapping.");
		}
	}
}