Convert from javascript to Ajax

[balkan7]

Hello guys, how can i convert my java script code to ajax ?

 

code is:

echo "<script language=\"javascript\" type=\"text/javascript\">
  function banner_types(banner_c_id) {
   if (banner_c_id == 0) {
      banner_id_0.style.display = 'block';
      banner_id_1.style.display = 'none';
      banner_id_2.style.display = 'none';
      banner_id_3.style.display = 'none';
    } else if (banner_c_id == 1) {
      banner_id_0.style.display = 'none';
      banner_id_1.style.display = 'block';
      banner_id_2.style.display = 'none';
      banner_id_3.style.display = 'none';
    } else if (banner_c_id == 2) {
      banner_id_0.style.display = 'none';
      banner_id_1.style.display = 'none';
      banner_id_2.style.display = 'block';
      banner_id_3.style.display = 'none';
    } else if (banner_c_id == 3) {
      banner_id_0.style.display = 'none';
      banner_id_1.style.display = 'none';
      banner_id_2.style.display = 'none';
      banner_id_3.style.display = 'block';
    }
  }
  </script>";    
echo "<table class='tbl-border' cellpadding='0' cellspacing='1' align='center' width='80%' >\n<tr>
	<td class='tbl2'><b>".$locale['M_020']."</b>:
	</td>
	 <td class='tbl1'><select name='banner_type' class='textbox' style='width:120px' onchange=\"banner_types(this.options[this.selectedIndex].value);\">
	  <option value='0'>".$locale['M_021']."</option>
	  <option value='1'".(isset($_POST['add_banner']) && $banner_type == 1 ? " selected='selected'" : "").">".$locale['M_022']."</option>
	  <option value='2'".(isset($_POST['add_banner']) && $banner_type == 2 ? " selected='selected'" : "").">".$locale['M_023']."</option>
	  <option value='3'".(isset($_POST['add_banner']) && $banner_type == 3 ? " selected='selected'" : "").">".$locale['M_024']."</option>
	  </select></td></tr>  
	<tr>
	<td class='tbl1' align='center' colspan='2'>
	<div id='banner_id_0' style='display: block'></div>
	<div id='banner_id_1' style='display: none'><input type='text' name='banner_img' style='width:200px;' class='textbox'><span class='small2'><br>".$locale['M_025']."</span></div>
	<div id='banner_id_2' style='display: none'><input type='file' name='banner_file_img' class='textbox' style='width:250px;'><span class='small2'><br>".$locale['M_026']."</span></div>
	<div id='banner_id_3' style='display: none'><input type='file' name='banner_file' class='textbox' style='width:250px;'><span class='small2'><br>".$locale['M_027']."</span></div>
	</td></tr>";

[haku]

Ajax IS javascript.