From http://www.w3schools.com (Copyright Refsnes Data)

DHTML CSS

JavaScript can be used to change the style of an HTML element:

Examples

Change the style of the current element
How to change the style of an element using the this object.

Change the style of a specific element
How to change the style of an element using getElementById.

(You can find more examples at the bottom of this page)

JavaScript, DOM, and CSS

With HTML 4, JavaScript and the HTML DOM can be used to change the style any HTML element.

To change the style the current HTML element, use the statement:

style.property=new style

or more correctly:

this.style.property=new style

Try it yourself

To change the style of a specific HTML element, use the statement:

document.getElementById(element_id).style.property=new style

Try it yourself

More examples

Mouse Events
How to change the color of an element when the cursor moves over it.

Visibility
How to make an element invisible. Do you want the element to show or not?

More About JavaScript, DOM, And CSS

For a full overview please refer to the complete DOM Style Object Reference in our HTML DOM tutorial.

To learn more about CSS, find the complete CSS tutorial on our Home Page.