$('#somediv').stop(false, true).animate({marginLeft: '-=' + e.width() + 'px'}, options.speed, function(){ options.onNewSlide() })

• e.with() returns 640
• opctions.speed contains 800
• options.onNewSlide() contains a a custom callback function

It works fine in firefox. But i debugged it with jquery.lint because it was throwing some random error in IE. lint tells me:

When I called animate(...) with your args, an error was thrown! TypeError: c.speed is not a function { message="c.speed is not a function",  more...}
You passed:  [Object {  marginLeft="-=640px"}, 800, function()]

and it indicates me the line i have posted. I have checked the jquery doc, but my syntax seams ok.

Do you know what i am doing wrong?