Get height and width of element, apply it to tooltip

Get height and width of element, apply it to tooltip

Hi,

I have some code for creating a tooltip on two different elements on a page.

$(document).ready(function() {
      $('.h1_a').hover(function() {
         $('.h1_a #tooltip').fadeIn('fast');
      },
      function() {
         $('.h1_a #tooltip').fadeOut('fast');
      });
      
      $('.p1').hover(function() {
         $('.p1 #tooltip').fadeIn('fast');
      },
      function() {
         $('.p1 #tooltip').fadeOut('fast');
      });   
   });


I want it so on hover, #tooltip masks the entire area of an element.

At the moment, I have specified height and width in the CSS which work for the .h1_a element (#tooltip completly masks the area .h1_a takes up). But of course, .p1 has a different height and width, so #tooltip no longer has the right dimensions.

I've looked at the dimensions plugin for jquery ( http://brandonaaron.net/docs/dimensions/#code-samples ) but don't know how to impliment it.
I'm a novice. The above code is the most complicated thing I've done in javascript/jquery as of now.

Any help will be much apprieciated.
J