// Dream plugin code
(function($){
    $.fn.parallax = function(options){
        var $$ = $(this);
        offset = $$.offset();
        var defaults = {
            "start": 0,
            "stop": offset.top + $$.height(),
            "coeff": 0.95,
            "initPos": $$.position().top,
            "type": "element"
        };
        var opts = $.extend(defaults, options);
        if(opts.type == "image"){
			if (navigator.appName=='Microsoft Internet Explorer'){
				opts.initPos =  parseInt($$.css('backgroundPositionY'));
			}
			else{
				opts.initPos = $$.css('background-position').split(' ');
        		opts.initPos = parseInt(opts.initPos[1]);
			}
        }
        return this.each(function(){
            $(window).bind('scroll', function() {
                var win = $(window),
                	windowTop = win.scrollTop();

                if((windowTop >= opts.start) && (windowTop <= opts.stop)) {
                	var prnt = $$.parent(),
                		parenttop = prnt.offset().top,
                		parentheight = prnt.height(),
                		winheight = win.height(),
                		parentloc;
                		
                	if (parenttop < 10) { parentloc = parenttop + winheight; } else { parentloc = parenttop; }
                	
                	if(opts.type == 'element'){
	                    newCoord = parseInt(opts.initPos) + ((parseInt(winheight) + parseInt(windowTop) - parseInt(parentloc)) * opts.coeff);
	                    //console.debug('initpos' + opts.initPos + ' newCoord: ' + newCoord + ' windowTop: ' + windowTop + ' parentoffsetTop: ' + $$.parent().offset().top + ' coeff:' + opts.coeff + ' winheight:' + $(window).height());
	                    $$.css({
	                        "top": newCoord + 'px'
	                	});
	                }
	                else if(opts.type == "image"){
	                	if (navigator.appName=='Microsoft Internet Explorer'){
	                		var newCoordY = $$.css('backgroundPositionY');
	                		newCoordY = opts.initPos + ((windowTop - parenttop) * opts.coeff);
	                		$$.css({
		                        "backgroundPositionY": newCoordY + 'px' 
		                	});
	                	}
	                	else{
	                		newCoord = $$.css('background-position').split(' ');
	                		newCoord[1] = opts.initPos + ((windowTop - parenttop) * opts.coeff);
	                		$$.css({
		                        "background-position": newCoord[0] + newCoord[1] + 'px' 
		                	});
	                	}
	                }
            	}
        	});
        });
    };
})(jQuery);