Give something like this a shot....
var open = true;
$(".close").click(function () {
if(open === false) {
open = true;
slideout.animate({ right: '-475px'}, { queue: false, duration: 500 });
} else if(open === true) {
open = false;
slideout.animate({ right: '75px'}, { queue: false, duration: 500});
}
});
The 'open' variable will give us a means to know whether or not our slide out is hidden or not. Thus giving the click event a means to know how it should animate the slide out. It's set initially to true sense the slide out starts out visible to the user. I wasn't sure which of your animates was sliding out vs sliding in, so you may need to switch them around based on the existing logic. But I hope this gives you some idea of what to aim for and try out.