function openWindow( image,width,height )
{
	width = width+20;
	height = height+20;
 	newWindow = window.open( image,"imageWindow","width="+width+",height="+height );
	newWindow.focus();
}

function showLargeImage( image_name )
{
	var leftPos = screen.width ? ( screen.width - 400 ) / 2 : 0;
	var topPos = screen.height ? ( screen.height - 400 ) / 2 : 0;
	
	url = "product_image.php?image=" + image_name;
	newWindow = window.open( url, "", "width="+300+",height="+300+",left="+leftPos+",top="+topPos );
}