I know ajax...but having a crazy time making the jquery do the same function....

I'm passing a variable and appending it to the page. How can I re create that function with jquery?

Here's my ajax code below:

 

  
 function filterColumn(){ 
  

var tl = document.getElementById('tl').value; 

  
dim();
loader();

  
nocache = Math.random();
  
http.open('get', 'include/filterColumn.php?tl='+tl);
  
http.onreadystatechange = doFilter;
  
http.send(null);
  
}
  

  

function doFilter() {

  
if(http.readyState == 4){ 
  
closeDim();
  
var response = http.responseText;
  

  
document.getElementById('updateQualitySpan').innerHTML = ' ' +response+ '';
  
}
  
}