function Alert(message, title) {

    var win;
    
    var handleOkDialog = function() {
        win.hide();
    };

    win = new YAHOO.widget.SimpleDialog("win",
			    { width: "300px",
			        fixedcenter: true,
			        visible: false,
			        draggable: false,
			        close: true,
			        text: "<div class='default_dialog'>" + message + "</div>",
			        constraintoviewport: true,
			        buttons: [{ text: "Ok", handler: handleOkDialog, isDefault: true }],
			        modal: false,
			        underlay: "none",
			        zIndex: 2000
			    });

			    if (title == undefined) {
			        win.setHeader("Atenção");
			    }
			    else {
			        win.setHeader(title);
			    }
			    
    win.render(document.body);
    win.show();

	return win;
}