jQuery.fn.center = function() {
        // Always return each...
        return this.each(function() {
                var t = jQuery(this);

                // Set position to other than 'static' so element shrink-wraps and width/height is calculated properly
                t.css({position: 'fixed'});

                // Why are there no jQuery.fn.outerWidth/Height:s?
                var w = t.width(), 
                        h = t.height(), 
                        lrPadding = parseInt(t.css('paddingLeft'), 10) + parseInt(t.css('paddingRight'), 10), 
                        lrBorder = parseInt(t.css('borderLeftWidth'), 10) + parseInt(t.css('borderRightWidth'), 10), 
                        tbPadding = parseInt(t.css('paddingTop'), 10) + parseInt(t.css('paddingBottom'), 10), 
                        tbBorder = parseInt(t.css('borderTopWidth'), 10) + parseInt(t.css('borderBottomWidth'), 10), 
                        leftMargin = (w + lrPadding + lrBorder) / 2;
                        topMargin = (h + tbPadding + tbBorder) / 2;

                t.css({
                        position: 'fixed', 
                        left: '50%', 
                        top: '50%', 
                        marginLeft: '-' +leftMargin +'px', 
                        marginTop: '-' +topMargin +'px', 
                        zIndex: '99'
                });
				
				if (
						(navigator.appName == 'Microsoft Internet Explorer')
						&&
						(navigator.version < 7)
					)
				{
					var leftPos = (jQuery(window).width() - jQuery(this).outerWidth()) / 2 + jQuery(window).scrollLeft(); 
					var topPos = (jQuery(window).height() - jQuery(this).outerHeight()) / 2 + jQuery(window).scrollTop();
	
					// Make sure element is not out of bounds
					
					leftPos = (leftPos < 0) ? 0 : leftPos;
					topPos = (topPos < 0) ? 0 : topPos;
	
					jQuery(this).css({left: leftPos +'px', top: topPos +'px', zIndex: '1000'});
				}
        });
};