| Term | Definition |
| Array | A collection of similar objects that can be accessed by means pf a variable name and an index. |
| Cycling banner (ad banner) | A sequence of graphic images that are displayed on after another with a small pause between each image change. |
| Decrement | Means to subtract 1 from the current value of a variable. |
| Event | A system-level response to the occurrence of some specific condition. |
| Function | A segment of JavaScript code that can be invoked or called just like the document. Such as .write(), and alert() |
| Hyper-link rollover | Triggered when the user moves the mouse over a hyper-link, rather than when the mouse rolls over an image. |
| Image rollover | The change in the appearance of an image whenever the user moves the mouse pointer over it. |
| Increment | To add one variable. |
| Index | An integer variable that identifies which element of an array is being referenced. |
| Instantiate | The process of creating a new object and assigning it a value. |
| Real number (floating-point number) | A floating-point number, is a numerical value that includes a decimal portion. |
| Slide Show | When you allow the user to change the image by clicking on some object with the mouse. |
| Variable | A name that is assigned to a literal value or to an object. |