/* fixedBox : fixed box jQuery plugin
* Copyright (C) 2007 Jean-Francois Hovinne - http://www.hovinne.com/
* Dual licensed under the MIT and GPL licenses.
*/

jQuery.fn.fixedBox = function(options)
{

	options = jQuery.extend({

		x: false,
		y: false

	}, options);

	return (this.each(function()
	{
		var x = y = 0;

		if (!options.x || !options.y)
		{
			//compute top and left positions

			var ww = document.documentElement.clientWidth
                     || document.body.clientWidth;
			var hh = document.documentElement.clientHeight
                     || document.body.clientHeight;

			//Opera
			//if (jQuery.browser.opera) hh = document.body.clientHeight;

			var w = jQuery(this).width();
			var h = jQuery(this).height();

			var padx = jQuery(this).css('padding-left');
			padx = parseInt(padx.substring(0, padx.length - 2));
			var pady = jQuery(this).css('padding-top');
			pady = parseInt(pady.substring(0, pady.length - 2));

			var borx = jQuery(this).css('border-left-width');
			borx = parseInt(borx.substring(0, borx.length - 2));
			if (!borx) borx = 0;
			var bory = jQuery(this).css('border-top-width');
			bory = parseInt(bory.substring(0, bory.length - 2));
			if (!bory) bory = 0;

			x = Math.round((ww - w - 2 * padx - 2 * borx) / 2);
			y = Math.round((hh - h - 2 * pady - 2 * bory) / 2);
		}

		if (options.x) x = parseInt(options.x);
		if (options.y) y = parseInt(options.y);

		//handle MSIE 6.0
		if (jQuery.browser.msie && jQuery.browser.version == '6.0')
		{

			//see http://www.howtocreate.co.uk/fixedPosition.html
			var expression = "( " + y + " + ( ignoreMe = "
                           + "document.documentElement.scrollTop ? "
                           + "document.documentElement.scrollTop : "
                           + "document.body.scrollTop ) ) + 'px'";

			jQuery(this).get(0).style.setExpression("top", expression);

			jQuery(this).css({
				position: 'absolute',
				zIndex: '1000',
				left: x + 'px',
				display: 'block'
			});

		}
		else
		{
			jQuery(this).css({
				position: 'fixed',
				zIndex: '1000',
				top: y + 'px',
				left: x + 'px',
				display: 'block'
			});
		}
	}));
};