SO jQuery Fiddle
Test Fiddle mainly for SO Questions jQuery 1.4.3, UI 1.8.5
by Nick Craver
HTML
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/themes/ui-lightness/jquery-ui.css">
JavaScript
this.myArray = [0,1,2,3,4,5,6,7,8,9];
var temp = this.myArray[3];
this.myArray[3] = this.myArray[7];
this.myArray[7] = temp;
alert(this.myArray);