With jQuery you can hide and show page elements very easily. The page elements can be anything such as a div, an image, a paragraph or anything that is on your webpage really.
This is how you do it:
$(this).hide() //hides current element
$("p").hide() //hides all paragraphs
$("p.test").hide() //hides all paragraphs
$("#test").hide() //hides the element with id="test"