if(!window.ZIMG)
	ZIMG=new Object();
ZIMG.ImageZoomRunning = false;

ZIMG.zoomOn = function(img, zoomStep, maxZoom)
{
	if(img)
	{
		if(!zoomStep)
		{
			if(img.mode == "EXPAND")
				zoomStep = img.style.height/10 +'px';
			else
				zoomStep = img.style.width/10 +'px';
		}

		if(!maxZoom)
		{
			if(img.mode == "EXPAND")
				maxZoom = img.style.height/2 +'px';
			else
				maxZoom = img.style.width/2 +'px';
		}


		if(img.state == null)
		{
			img.state = "OFF";
			img.index = 0;
			img.orgWidth = img.width;
			img.orgHeight = img.height;
			img.zoomStep = zoomStep;
			img.maxZoom  = maxZoom;
		}

		if(img.state == "OFF")
		{
			img.state = "ZOOM_IN";
			start_zooming();
		}
		else if( img.state == "ZOOM_IN_OUT"
			|| img.state == "ZOOM_OUT")
		{
			img.state = "ZOOM_IN";
		}
	}
}
ZIMG.zoomIn = function(img, zoomStep, maxZoom)
{
	img.mode = "ZOOM";
	ZIMG.zoomOn(img, zoomStep, maxZoom);
}
ZIMG.zoomOut = function(img)
{
	if(img)
	{
		if(img.state=="ON")
		{
			img.state="ZOOM_OUT";
			start_zooming();
		}
		else if(img.state == "ZOOM_IN")
		{
			img.state="ZOOM_IN_OUT";
		}
	}
}

function start_zooming()
{
	if(!ZIMG.ImageZoomRunning)
		ImageZoomAnimation();
}

ZIMG.setZoom = function(img)
{
	if(img.mode == "EXPAND")
	{
		img.style.width  = img.orgWidth + 'px';
		img.style.height = img.orgHeight + img.index;
	}
	else
	{
		img.style.width  = img.orgWidth   + img.index; + 'px'
		img.style.height = img.orgHeight  + (img.index * (img.orgHeight/img.orgWidth)) + 'px';
	}
}


function ImageZoomAnimation()
{
	ZIMG.ImageZoomRunning = false;
	for(i=0 ; i<document.images.length ; i++)
	{
		var img = document.images[i];
		if(img.state)
		{
			if(img.state == "ZOOM_IN")
			{
				img.index+=img.zoomStep;
				if(img.index > img.maxZoom)
					img.index = img.maxZoom;

				ZIMG.setZoom(img);

				if(img.index == img.maxZoom)
					img.state="ON";
				else
					ZIMG.ImageZoomRunning = true;
			}
			else if(img.state == "ZOOM_IN_OUT")
			{
				img.index+=img.zoomStep;
				if(img.index > img.maxZoom)
					img.index = img.maxZoom;

				ZIMG.setZoom(img);
	
				if(img.index == img.maxZoom)
					img.state="ZOOM_OUT";
				ZIMG.ImageZoomRunning = true;
			}
			else if(img.state == "ZOOM_OUT")
			{
				img.index-=img.zoomStep;
				if(img.index < 0)
					img.index = 0;

				ZIMG.setZoom(img);

				if(img.index == 0)
					img.state="OFF";
				else
					ZIMG.ImageZoomRunning = true;
			}
		}
	}
	
	if(ZIMG.ImageZoomRunning)
		setTimeout("ImageZoomAnimation()", 40);
}