animate a dir right position like toggle

i have a div that start like so:
right: -50%;

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i need to toggle it to:
right: -90%;

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i tried toggle but it doesn't just move it, it is like hide and show. i just need to toggle its right between these two points.
so i have this, and it works but it doesn't act like a toggle:
$('#menu-btn').on("click",function(e) {
 $('.slide').animate({"right": '-90'});

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what am i missing here? how to make it act like a toggle?

best regards
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Rainer JeschorCommented:

please try this:
$('#menu-btn').on("click",function(e) {
 if ($('.slide').css('right') == '-90%') {
	$('.slide').css('right') = '-50%';
 } else {
	$('.slide').css('right') = '-90%';

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Which jQuery version are you using?

derridaAuthor Commented:
Hi Rainer
i am using 1.10.2

but i found out that if you use jquery ui with toggleClass i can get exactly what i wanted:
$('#menu-btn').on("click",function(e) {
    $(".slide").toggleClass('open', 1000, "easeOutSine");
    return false;

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then in the open class just change the right property.

do not know if i can give myself points, but someone else might find it helpfull.

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