[jQuery] using variables with jquery

[quirksmode]

Hi,

I need to make a div slide across the screen using the animate
command. It works when I use the following:

$('#js_innerwrapper').animate({left:"+=500"}, 1000, 'easeOutSine');


However, i need to be able to change the 500 to be width of the div,
which i get using:

$.gamewidth = $('.gamewrapper').width();


I then need to combine the two which does not seem to work:

$('#js_innerwrapper').animate({left:"+=$.gamewidth"}, 1000,
'easeOutSine');

Any ideas?