jQuery.fn.modal = function(options)
{
	if(!options)
	{
		if(this.attr('href')) var options = { url: this.attr('href') };
	}
	else
	{
		if(!options.url) if(this.attr('href')) options.url = this.attr('href');
	}
	
	var settings = {
		url: '#',
		backgroundColor: '#000',
		backgroundOpacity: 0.5,
		position: 'center',
		referencePosition: this,
		top: 0,
		left: 0,
		closeEsc: true,
		closeClickOut: true,
		autoOpen: false
	};
	options = jQuery.extend(settings, options);
	
	
	function openModal()
	{
		/*CREATE ELEMENTS*/
		$('body').append($('<img />').attr({src: $.url(true) + "imagens/load.gif", width: 88, height: 78, alt: "", className: 'load'})).append($('<div></div>').addClass('bg_modal')).append($('<div></div>').addClass('view_modal'));
		
		// verificando se o body é menor do que o screen
		var altura = $('html')[0].scrollHeight < $(window).height() ? $(window).height() : $('html')[0].scrollHeight;
		$('.bg_modal').width($('html')[0].scrollWidth).height(altura);
		
		/*OPACITY*/
		if(options.backgroundOpacity != 0){
			$('.bg_modal').css('background-color',options.backgroundColor);
			$('.view_modal').css('opacity', 0);
			$('.bg_modal').css('opacity', 0);
		}
		
		// escondendo selects
		$('select').css('visibility', 'hidden');

		// posicionamento
		if(options.position=='relative'){
			var offset  = options.referencePosition.offset();
			leftModal = offset.left;		
			topModal =  offset.top;		
		}
		
		/*SHOW BACKGROUND*/
		$('.bg_modal').fadeTo('fast', options.backgroundOpacity, function() {
			$('.view_modal').load(options.url,{nocacheattr:(new Date()).getTime()}, function() {
			
				/*REMOVE LOAD*/
				$('.load').remove();
				
				GB_getPageScrollTop = function() {
					var yScrolltop;
					if (self.pageYOffset) {
						yScrolltop = self.pageYOffset;
					} else if (document.documentElement && document.documentElement.scrollTop || document.documentElement.scrollLeft) {
						yScrolltop = document.documentElement.scrollTop;
					} else if (document.body) {
						yScrolltop = document.body.scrollTop;
					}
					return yScrolltop;
				}
				
				/* CENTRALIZE MODAL */
				if(options.position != 'center'){
					var alturaModal = parseInt(options.top) + parseInt(topModal) + parseInt($('.view_modal').height());
					if(altura<alturaModal){
						options.top = 0;
						topModal = altura - parseInt($('.view_modal').height());
					}
				
					$('.view_modal').css({
							marginTop: topModal, 
							marginLeft: leftModal,
							left: options.left,
							top: options.top
						}
					);
					
				} else {
					
					topModal = parseInt(GB_getPageScrollTop() - ($('.view_modal').height()/2));
					leftModal = -parseInt($('.view_modal').width()/2);
					
					topModal = Math.max(topModal, -220);

					$('.view_modal').css({marginTop: topModal, marginLeft: leftModal});
				}

				/* MODAL HIDE */
				if(options.backgroundOpacity != 0)
				{
					$('.view_modal').fadeTo('fast', 1, function(){
						$(this).css({'opacity': null});
					});
				}

				/* CLOSE MODAL */
				$("a[rel*=modal-close]").click(function() {
					closeModal();
					return false;
				})
			});
		});
		
		if(options.closeClickOut==true){
			$('.bg_modal').click(function(){
				closeModal();
			});
		}

		if(options.closeEsc==true){
			$(window).keydown(function(event){
				if(event.keyCode==27)closeModal();
			});
		}
		return false;
	}

	if(options.autoOpen == false){
		this.click(openModal);	
	} else {
		openModal();
	}
		
	/*CLOSE MODAL*/
	function closeModal(){
		/*HIDE MODAL*/
		$('.view_modal').fadeTo('fast', 0, function(){$(this).remove();});
		
		/*HIDE BACKGROUND*/
		$('.bg_modal').fadeTo('fast', 0, function() {
			$(this).remove();
			$('select').css('visibility', 'visible');
		});
		
		$(window).unbind();
		$('.bg_modal').unbind();
	}	

	
	this.css('visibility','visible');
};

$(document).ready(function(){
	$('a[rel="modal"]').each(function(){
		$(this).modal();	
	});
});