/* functions to resize, open and close browser windows. */

/* This function resizes the browser window to frame an image in the
HTML document. Call it from the onLoad handler. */
function ResizeWindowToImage()
{
	var pictureWidth;		// The width in pixels of the display image.
	var pictureHeight;		// The height in pixels of the display image.
	var windowWidth;		// The width of the display window.
	var windowHeight;		// The height of the display window.
	var marginH;			// Padding to add to size of window horizontally (x2).
	var marginV;			// Padding to add to size of window vertically (x2).
	var aspectRatio = 1;	// Ratio of width to height of image.
	var maxH;			// Maximum allowed window width.
	var maxV;			// Maximum allowed window height.
	
	/* set margins for the document. windows requires wider margins than mac. */
	if (getPlatform() == "Macintosh")	{ marginH = 12; marginV = 20; }
	else							{ marginH = 15; marginV = 35; }
	
	/* find out how big the users screen is. we need to know so we can calculate
	the largest window that we should display. */
	maxH = (screen.availWidth - 20); maxV = (screen.availHeight - 20);
	
	/* get the dimensions of the image and size the window accordingly. */
	pictureWidth = document.images[0].width;
	pictureHeight = document.images[0].height;
	windowWidth = pictureWidth + (marginH * 2);
	windowHeight = pictureHeight + (marginV * 2);
	aspectRatio = pictureWidth/pictureHeight;
	
	/* constrain the size of the window if it is too big. */
	if (windowWidth > maxH)
	{
		windowWidth = maxH;
		windowHeight = pictureWidth/aspectRatio;
		windowHeight = (windowHeight > maxV) ? maxV : windowHeight;
	}
	else if (windowHeight > maxV)
	{
		windowHeight = maxV;
		windowWidth = windowHeight * aspectRatio;
		windowWidth = (windowWidth > maxH) ? maxH : windowWidth;
	}
	
	window.resizeTo(windowWidth, windowHeight);
}


function OpenImageWindow(theURL,winName)
{
	window.open(theURL,winName,"scrollbars=no");
}


function OpenImageWindowWithScroll(theURL,winName)
{
	window.open(theURL,winName,"scrollbars=yes");
}


function CloseWindow()
{
	window.close();
}


function getPlatform()
{
	var agentString = navigator.appVersion.toLowerCase();
	
	if (agentString.indexOf("macintosh") != -1)
	{
		this.isMac = true;
		return "Macintosh";
	}
	else if (agentString.indexOf("windows") != -1)
	{
		this.isWindows = true;
		return "Windows";
	}
	else
		return "Unknown";
}