title: The jQuery :eq(index) selector
body: <p>I want to use the jQuery :eq(index) selector dynamically, which means I want to supply a variable as the index and choose the corresponding element dynamically. But it seems that it doesn't work. I think it's because the quotation marks. As this selector is used as, for example, $('ul li:eq(3)'), when I provide a variable as the index, maybe the index is viewed as a part of the string in the selector instead of a variable. Is it right? How can I fix this and choose the element dynamically?</p>